ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Molecular beam optical Stark spectroscopy of YF (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 8580-8585 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The molecular-beam-optical Stark spectrum of the B1Π(v=0)−X 1Σ+(v=0) band system of YF has been recorded and analyzed. The permanent electric dipole moment μ and the magnetic hyperfine parameter a for the B1Π state were experimentally determined to be 2.96(4) D and 146.8(3) MHz and the experimentally determined value for μ(X 1Σ+) is 1.82(8) D. The sign of the magnetic hyperfine parameter indicates that the major contribution to the B1Π state is from a⋅⋅⋅πδ configuration. The determined μ(X 2Σ+) value is compared with theoretical predictions and the ratio μ(X 1Σ+)/μ(B 1Π) is rationalized in terms of plausible molecular orbital descriptions for the two electronic states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459244
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The excited electronic states and the ionization potential of the AlND3 complex (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 1733-1743 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The AlND3 complex was studied in a molecular beam by resonant one-color two-photon and two-color two-photon photoionization techniques with a resolution of 0.3 cm−1. Six progressions of bands were observed in the 18 100–26 200 cm−1 (381–552 nm) region. One progression (ωe=316±0.8 cm−1) was assigned to the Al–ND3 stretch (ν3′) in the B˜2A1 state correlating with the 3s 2S term of Al. The origin of the B˜2A1–X˜2E1/2 system was found at 18 532.5±0.7 cm−1. The second (ωe=428±2 cm−1) and third (ωe=594±12 cm−1) progressions were assigned to the Al–ND3 stretch (ν3′) and the bend (ν6′) in the C˜2E state correlating with the 3d 2D term of Al. The origin of the C˜2E–X˜2E1/2 system was found at 21 185±5 cm−1. Assignments of the other three progressions with origins and harmonic wave numbers of 22 667±2 and 358±2 cm−1; 24 382±10 and 432±10 cm−1; and ∼21 871 and ∼1050 cm−1 remain uncertain. The spin-orbit splitting of the X˜2E ground state was determined to be 55.8±0.7 cm−1. Several Rydberg series converging to the v3+=1, 2, and 3 levels of the ground state of the AlND3+ ion were observed. The ionization potential of the AlND3 complex was measured to be 39 710±2 cm−1. The ν3+ fundamental in the ground state of the AlND3+ ion was found to be 325±5 cm−1. To aid the interpretation of our spectra, ab initio optimized structures and vibrational wave numbers for the ground states of various isotopomers of AlNH3 and AlNH3+ were calculated. Also, Al–NH3 potential curves for several low-lying excited states were calculated. In addition, the ionization potential of the AlNH3 isotopomer was measured by the one-photon photoionization efficiency technique. The value of 39 760±10 cm−1 is an improvement on that previously reported by Di Palma et al. [Chem. Phys. Lett. 284, 184 (1998)], which was 180 cm−1 smaller. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480738
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    High resolution molecular beam study of the origin band of the B˜ 2Σ+–X˜ 2Σ+ system of yttrium imide (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 1483-1493 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The (0,0,0)–(0,0,0) band of the B˜ 2Σ+–X˜ 2Σ+ system of three isotopomers of yttrium imide (Y14NH, Y15NH, and Y14ND) has been studied by laser-induced fluorescence in a molecular beam apparatus. Rotational, fine, and nuclear magnetic hyperfine structures have been resolved and analyzed. The B˜ 2Σ+(0,0,0) state of Y14NH, Y14ND, and Y15NH is severely perturbed below J=30.5 by eight, three, and two vibronic states, respectively. Although, the nature of these perturbing states can only be speculated upon, their symmetries are either 2Σ or 2Π, and this has made it possible to deperturb the B˜ 2Σ+ state successfully. The spectra can be reproduced within 140 MHz (0.0047 cm−1). The analyses confirm that the molecule is linear in both states with the nuclear arrangement Y–N–H. The bond lengths in the ground X˜ 2Σ+ state and the B˜ 2Σ+ state have been derived to be rY–N=1.877 57(13) Å, rN–H=1.0067(10) Å, and rY–N=1.8839(43) Å, rN–H=1.242(30) Å, respectively. The results are compared with the values of ab initio calculations on YNH and YN, and the experimental data on YN and YO. The atomic character of the unpaired electron in the ground state is 58% Y + 5s and 42% Y + 5p. The electron configurations for the ground X˜ 2Σ+ state and the B˜ 2Σ+ state are discussed and compared with ab initio calculations whenever possible. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479407
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The SiP molecule: The first observation and spectroscopic characterization (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 6513-6520 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: SiP molecules have been produced in a molecular free jet apparatus by laser vaporizing a silicon rod in the presence of He doped with phosphine (PH3) gas. Excitation spectra have been observed in the 21200–22350 cm–1 range by monitoring laser induced fluorescence. Dispersed fluorescence spectra have been recorded out of the upper states of the excitation bands. The ground electronic state is X 2Πi with the spin–orbit splitting A=−186.774(11) cm−1, the harmonic wavenumber ωe=615.7(6) cm−1, and the equilibrium internuclear distance re=2.0775(17) Å. Two excited electronic states, A 2Σ+ and B 2Σ+, are observed at T0=427.4(5) and 21317.1(1) cm−1, respectively. The harmonic wavenumbers, ωe, and the equilibrium internuclear distances, re, are 680(2) cm−1 and 1.9658(13) Å, respectively, for the A 2Σ+ state and 455(1) cm−1 and 2.1278(8) Å, respectively, for the B 2Σ+ state. For the X 2Πi, A 2Σ+, and B 2Σ+ electronic states, RKR potentials have been generated. Franck–Condon factors for the B–X, B–A, and A–X systems have been calculated. A 2Σ+, v∼X 2Π1/2, v+1 perturbations have been observed. A deperturbation procedure has yielded the off-diagonal spin–orbit electronic matrix element equal to 51(8) cm−1. This work represents the first spectroscopic investigation of the SiP molecule. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1462582
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    High resolution molecular beam study of the origin bands of the A˜ 2Π–X˜ 2Σ+ and A˜″ 2Π1/2–X˜ 2Σ+ systems of yttrium imide (Y14NH, Y15NH, and Y14ND) (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 3591-3601 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The (0,0,0)–(0,0,0) bands of the A˜ 2Π–X˜ 2Σ+ and A˜″ 2Π1/2–X˜ 2Σ+ systems of three isotopomers of yttrium imide (Y14NH, Y15NH, and Y14ND) have been studied by laser-induced fluorescence in a molecular beam apparatus. Rotational, fine, and nuclear magnetic hyperfine structures have been resolved and analyzed. The previously studied B˜ 2Σ+−X˜ 2Σ+ (0,0,0)–(0,0,0) bands of the three isotopomers have been reanalyzed. Global fits of all observed bands, in which the ground state has been fitted to a Hamiltonian model, while the excited states have been represented by term values, have been performed for the three isotopomers. Subsequently, the individual bands have been fitted. The ground state parameters have been fixed at the values obtained in the global fits, while the upper states have been fitted to the Hamiltonian models. The (0,0,0) A˜ 2Π state of Y14NH, Y15NH, and Y14ND is severely perturbed. Even though the nature of these perturbing states can only be speculated upon, the introduction of effective perturbers made it possible to deperturb the state successfully. The A˜″ 2Π1/2 state is unperturbed. The spectra can be reproduced to better than 120 MHz (0.004 cm−1). The analyses confirm that the molecule is linear in all four states with the nuclear arrangement Y–N–H. The bond lengths (r0 structure) in the X˜ 2Σ+ ground state and the A˜″ 2Π1/2, A˜ 2Π, and B˜ 2Σ+ excited states have been derived to be rYN=0.187785(17) nm, rNH=0.10039(14) nm; rYN=0.1927(1) nm, rNH=0.081(1) nm; rYN=0.19013(56) nm, rNH=0.1032(54) nm; and rYN=0.18848(52) nm, rNH=0.1236(46) nm, respectively. The electronic configurations for the X˜ 2Σ+ ground state and the A˜ 2Π, A˜″ 2Π1/2, and B˜ 2Σ+ excited states are discussed and compared with ab initio calculations whenever possible. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287401
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Resonant two photon ionization spectroscopy of the molecules V2, VNb, and Nb2 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 4485-4495 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Resonant two photon ionization (R2PI) spectroscopy was used to obtain detailed spectroscopic information on the neutral and cation ground states of the jet-cooled molecules V2, VNb, and Nb2. By recording photoionization efficiency (PIE) spectra, their adiabatic ionization potentials were determined to be 51 269(5) cm−1 (V2), 51 554(10) cm−1 (VNb), and 51 359(10) cm−1 (Nb2). In VNb, we used different ionization routes to determine that the splitting between the Ω=0 and Ω=1 spin–orbit components of the X 3Σ− ground state was 230(3) cm−1. In the case of V2 and VNb, two thresholds were observed in the PIE spectra recorded via Ω=1 intermediate states. We were thus able to assign the ground states of V+2 and VNb+ as having 4Σ− symmetry, with second-order spin–orbit splittings of 20(3) and 82(3) cm−1, respectively. A simple model was applied to calculate the locations of the 1Σ+ and 2Σ+ states which are responsible for the second-order spin–orbit splitting of the neutral and cation ground states, respectively. One-color R2PI spectroscopy was employed to determine the bond dissociation energy of VNb, the result D00=30 562(10) cm−1 being obtained. The implications of our measurements regarding the relative bond strengths of the neutral and cationic dimers are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468462
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Laser spectroscopy of the A˜ 2Π←X˜ 2Σ+ transition of ytterbium monoacetylide (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 2720-2727 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The first spectroscopic identification and characterization of ytterbium monoacetylide (YbCCH) is reported. By combining resonance-enhanced two photon ionization (R2PI), laser-induced fluorescence (LIF), and photoionization efficiency spectroscopy (PIE) with density functional calculations the X˜ 2Σ+ and the A˜ 2Π1/2,3/2 states of YbCCH as well as the X˜ 1Σ+ state of YbCCH+ have been characterized. The A˜ 2Π1/2,3/2–X˜ 2Σ+ system whose 0-0 band for the A˜ 2Π1/2 component lies at around 16 848 cm−1 for YbCCH has been studied at 0.3 cm−1 resolution. The excitation spectra, both R2PI and LIF are characterized by progressions involving the YbCC bending mode (ν5) whose wave number has been determined to be 96 and 103 cm−1 for the X˜ 2Σ+ and A˜ 2Π1/2,3/2 state, respectively. The dispersed fluorescence spectra show a progression in the Yb-C stretching vibration with a wave number of ω(ν3)=328 cm−1. Density functional calculations confirmed the vibrational assignment and yielded a linear geometry for both the X˜ and A˜ state of YbCCH as well as for the X˜ 1Σ+ state of the cation. Photoionization efficiency spectroscopy yielded an adiabatic ionization potential of 47 165(10) cm−1 [5.8477(12) eV]. Rydberg series converging to the 51 and 52 level of YbCCH+ were observed and combined with the appearance potentials led to ω(ν5)=97 cm−1 for the YbCC bending mode of YbCCH+. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474629
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Laser spectroscopy and density functional calculations on niobium monocarbide (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 307-318 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A survey of the jet-cooled Nb12C and Nb13C radicals has been carried out between 13 500 and 18 000 cm−1 using laser-induced fluorescence and resonant two-photon ionization spectroscopy. Several vibronic bands belonging to at least six band systems have been identified. Three of these systems appear to belong to 2Π1/2–2Δ3/2 transitions in which the lower 2Δ3/2 state is the ground electronic state of the molecule. The other three systems also terminate to the same three 2Π1/2 upper states, but originate from a state lying 830 cm−1 above the X 2Δ3/2 state. This state is assigned as the A 2Σ+ state. The ionization potential has been determined to be 56 402±15 cm−1 or 6.9929±0.0018 eV using two-color photoionization efficiency spectroscopy. This value, combined with the ionization potential of Nb and the bond energy of NbC+, yields an improved bond energy of 5.39±0.15 eV for NbC. The (4,0) band of the B 2Π1/2–X 2Δ3/2 system has been studied at a resolution of approximately 0.005 cm−1 using laser-induced fluorescence spectroscopy. The nuclear magnetic hyperfine structure has been resolved in both states, and an analysis confirms that the 2Δ ground state arises from the σ2δ1 electron configuration in which the unpaired δ electron is a pure Nb 4d electron associated with the 4F term arising from the excited 5s24d3 electron configuration. Density functional calculations have been carried out on the lowest 2Δ, 2Σ+, 4Δ, 2Π, and 4(Π,Φ) states of the neutral and the 1Σ+, 3Δ, and 3(Π,Φ) states of the cations. These calculations fully support the experimental evidence for the ground state. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474391
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Photoionization spectroscopy of dichromium and dimolybdenum: Ionization potentials and bond energies (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 9668-9674 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photoionization spectroscopy has been used to probe molecular beams of laser-vaporized chromium (Cr2) and molybdenum (Mo2) dimers. Two-color photoionization efficiency spectroscopy has been used to determine the adiabatic ionization potential (IP) of Cr2 and Mo2 to be 56 449±8 cm−1 and 56 042±8 cm−1, respectively. The IP of Cr2 is combined with the IP of Cr [54 575.6±0.3 cm−1, Huber et al., Proc. R. Soc. London, Ser. A 342, 431 (1975)] and the bond energy of Cr2+ [10 200±500 cm−1, Su et al., Chem. Phys. Lett. 201, 199 (1993)] to yield a bond energy of 12 400±500 cm−1 for Cr2. One-color resonant two-photon ionization (R2PI) spectroscopy has been employed to probe the molybdenum dimer molecule in the energy region where its dissociation should occur. The dissociation limit has been ascribed to the threshold observed at 36 100±80 cm−1. This value is combined with the IP of Mo [57 204.3±0.3 cm−1, Rayner et al., J. Opt. Soc. Am. B 4, 900 (1987)] and Mo2 to yield a bond energy of 37 260±80 cm−1 for Mo2+. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476442
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Ionization potentials and bond energies of TiO, ZrO, NbO and MoO (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 8980-8992 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The adiabatic ionization potentials of TiO, ZrO, NbO, and MoO have been measured using two-color photoionization efficiency (PIE) spectroscopy and mass-analyzed threshold ionization (MATI). From the sharp ionization thresholds in the PIE and MATI spectra the following ionization potentials were derived: IP(TiO)=6.8197(7) eV, IP(ZrO)=6.812(2) eV, IP(NbO)=7.154(1) eV, and IP(MoO)=7.4504(5) eV. These values have been combined with the ionization potentials of the metal atoms and the bond energies of the transition metal oxide cations, D0(MO+) [M. R. Sievers et al., J. Chem. Phys. 105, 6322 (1996)] to derive the bond energies, D0(MO), of the neutral metal monoxides; D0(TiO)=6.87(7) eV, D0(ZrO)=7.94(11) eV, D0(NbO)=7.53(11) eV, D0(MO)=5.44(4) eV. It is argued that these values are more accurate than the currently accepted values and hence are recommended for future work. Experimental evidence suggests that the ground state of MoO+ is the 4Σ− state arising from the δ2σ1 configuration. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477568
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...