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
    The microwave spectrum of the LiO radical (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 137-141 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational spectra of the 7LiO radical in the v=0 and v=1 vibrational states were observed in the millimeter and submillimeter wave region. The LiO radical was generated by the reaction of lithium vapor with N2O directly in a high temperature absorption cell. The rotational and centrifugal distortion constants, Λ-type doubling constants, spin–orbit interaction constant, and hyperfine interaction constants were derived through analysis of the rotational spectra observed in the present study combined with the radio frequency spectra of Λ-type transitions reported by S. M. Freund et al. [J. Chem. Phys. 56, 1467 (1972)]. The LiO radical was confirmed to have a 2Πi ground electronic state with an exceptionally large Λ-type doubling constant, as in the case of NaO. A pure precession hypothesis applied to the observed p Λ-type doubling constant gives the Σ–Π energy difference to be 2565 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457500
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Infrared diode laser spectroscopy of lithium hydride (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6702-6706 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The fundamental and hot bands of the vibration–rotation transitions of 6 LiH, 7 LiH, 6 LiD, and 7 LiD were observed by infrared diode laser spectroscopy at Doppler-limited resolution. Lithium hydride molecules were produced by the reaction of the Li vapor with hydrogen at elevated temperatures. Some 40 transitions were observed and, after combined with submillimeter-wave spectra reported by G. M. Plummer et al. [J. Chem. Phys. 81, 4893 (1984)], were analyzed to yield Dunham-type constants with accuracies more than an order of magnitude higher than those published in the literature. It was clearly demonstrated that the Born–Oppenheimer approximation did not hold, and some parameters representing the breakdown were evaluated. The Born–Oppenheimer internuclear distance rBOe was derived to be 1.594 914 26 (59) A(ring), where a new value of Planck's constant recommended by CODATA was employed. The relative intensity of absorption lines was measured to determine the ratio of the permanent dipole moment to its first derivative with respect to the internuclear distance: μe /[(∂μ/∂r)e re ]=1.743(86). The pressure broadening parameter Δνp /P was determined to be 6.40 (22) MHz/Torr by measuring the linewidth dependence on the pressure of hydrogen, which was about four times larger than the value for the dipole–quadrupole interaction estimated by Kiefer and Bushkovitch's theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454415
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Infrared diode laser spectroscopic study of the active nitrogen. The electronic transition between the lowest singlet metastable states a 1Πg–a' 1Σ−u, 0–0 band (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 6434-6436 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The a 1Πg–a' 1Σ−u, 0–0 band of the molecular nitrogen was observed in an electric discharge plasma of nitrogen using infrared diode laser spectroscopy at Doppler-limited resolution. Precise values were obtained for the rotational constants and the energy separation between the two electronic states. The effect of Λ-type doubling in the a 1Πg state was observed as small shifts of Q branch and P/R branch transitions to higher and lower frequencies, respectively, than those expected if Λ doubling were absent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453474
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Infrared diode laser spectroscopy of the PF radical (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 3804-3806 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The infrared absorption spectrum of the PF radical in the X 3Σ− ground electronic state has been observed using a Zeeman modulated diode laser spectrometer. The radical was produced in a multiple-reflection absorption cell by a dc glow discharge in a mixture of PH3 and CF4. The F1 and F3 spin components of five vibration–rotation transitions of the v=1–0 band have been recorded in the region of 823 to 830 cm−1. By constraining molecular constants of the v=0 state to the values previously determined by microwave spectroscopy, the band origin, the vibration–rotation constant αB=B0−B1, and the vibrational change of the spin–spin interaction constant αλ=λ1−λ0 have been determined from the observed spectrum to be 837.816 36(70), 0.004 639 4(70), and −0.005 04(91) in cm−1, respectively, with one standard deviation in parentheses. The sign of αλ is the same as those of NCl and PCl, but is opposite to those of O2, SO, S2, and SeO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451938
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The microwave spectrum of the AlO radical (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 2146-2149 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational spectrum of the aluminum monoxide radical in the ground electronic state X 2Σ+ was observed in the millimeter- and submillimeter-wave region. Aluminum monoxide radicals were generated directly in a flow reactor absorption cell by the reaction of N2O with aluminum vaporized from a high-temperature crucible. The observed spectrum was analyzed to yield molecular constants including the rotational constant, centrifugal distortion constant, spin–rotation interaction constant, magnetic hyperfine interaction constants, and nuclear quadrupole coupling constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458005
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Detection of the silylene ν2 band by infrared diode laser kinetic spectroscopy (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 4582-4586 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The ν2 band of the silylene SiH2 molecule in X˜ 1 A1 was observed for the first time in the gas phase by using infrared diode laser kinetic spectroscopy. Silylene molecules were generated by the photolysis of phenylsilane at 193 nm. The observed spectrum was analyzed to determine the rotational and centrifugal distortion constants in the ground and v2 =1 states and the band origin ν0 =998.6241(3) cm−1 with one standard deviation in parentheses. The significance of the derived parameters is discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456746
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    The vibrational assignment for the A 2Π–X 2Σ+ band system of the SiN radical: The 0–0 bands of 29SiN and 30SiN (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 46-51 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The vibrational assignment for the A–X system of the SiN radical was reexamined by observing the spectra in the 5 μm region of 29SiN and 30SiN in natural abundance. The original assignment of Mulliken for the A state was found to be correct, rather than the one currently accepted, i.e., the 5 μm spectrum was assigned to the 0–0 band of the A–X system. The term value of the A state was thus modified to Te(A)=2032.4(1) cm−1 and the equilibrium internuclear distance in the A state was recalculated to be 1.641 879(20) A(ring), with the uncertainty in parentheses which was primarily due to that in Planck's constant. The vibrational and isotopic variations observed for the Λ-type doubling and the spin–orbit interaction constants of the A state and for the spin–rotation interaction constants in the X state were explained by treating the electronic matrix elements of the spin–orbit interaction and of the orbital angular momentum between the A/X, B/A, and D/X states as parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454627
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Observation of the gas-phase infrared spectrum of BH3 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 2438-2441 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The gas-phase spectrum of BH3 was detected for the first time by diode laser spectroscopy through the observation of the ν2 band. The borane was produced by photolysis of B2H6 or BH3CO with an ArF excimer laser. The same spectrum was obtained by a discharge in a B2H6 and He mixture. Line assignments were made for the Q-branch series with J=K of the ν2 band; effects due to Coriolis perturbations by the ν4 state were recognized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453135
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Microwave spectrum of alkali metal tetrahydroborate. I. Rotational transitions and molecular structure of NaBH4 in the ground vibrational state (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 7707-7712 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational spectrum of NaBH4 was observed in the millimeter-wave region using a high temperature absorption cell. The observed spectrum of NaBH4 showed the pattern of a symmetric top molecule: Strong and weak for K=3n and 3n±1, respectively, because of the nuclear spin statistical weight for C3v symmetry. The rotational and centrifugal distortion constants for the 11B and 10B species were determined. The observed rotational constants of Na11BH4 and Na10BH4, combined with the assumption that r(B–Hb)−r(B−Ht)=0.04 A(ring) and θ (Hb–B–Ht)=111°, gave estimates for r(Na–B) and r(B–Hb) to be 2.308±0.006 A(ring) and 1.28±0.10 A(ring), respectively, where the uncertainties are mainly due to those of the assumed values. This bond length obtained for Na–B is much shorter than the reported value in crystal: 3.08 A(ring). The bond lengths derived indicate that NaBH4 has a tridentate molecular structure with three bridging hydrogens. This result agrees with those of ab initio calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460156
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Detection of the NaO radical by microwave spectroscopy (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 3033-3037 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational spectrum of the NaO radical in the four lowest vibrational states was observed in the millimeter- and submillimeter-wave region. The NaO radical was generated by the reaction of the sodium vapor with N2O directly in a high-temperature absorption cell. Analysis of the observed spectra yielded the rotational and centrifugal distortion constants, Λ-type doubling constants, spin–orbit interaction constants, and hyperfine interaction constants in the four vibrational states. The NaO radical is clearly shown to have the 2Πi ground electronic state with an anomalously large Λ-type doubling constant and very small hyperfine interaction constants. The molecular constants derived are discussed in terms of the ionic character of the bond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455905
    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...