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  • 1
    Electronic Resource
    Electronic Resource
    Electron spin resonance of free radicals prepared by the reactions of methylene. Deuteriomethyl and formaldiminoxy radicals (1971)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 75 (1971), S. 2448-2452 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100685a006
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  • 2
    Electronic Resource
    Electronic Resource
    Microwave spectrum and structure of pyrrole-2-carbonitrile (1980)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 84 (1980), S. 1767-1771 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100451a005
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  • 3
    Electronic Resource
    Electronic Resource
    The microwave spectrum, spin-rotation coupling constants, and structure of thiocarbonyl fluoride, SCF2, observed with a cavity microwave Fourier transform spectrometer (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 3931-3939 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The microwave spectrum of thiocarbonyl fluoride, SCF2, has been investigated in the frequency range of 6.7–18.4 GHz using a pulsed molecular-beam microwave Fourier transform spectrometer. Twelve a-type transitions of the 32S12C19F2 isotopomer with J between 0 and 9, including ΔKa=2 transitions, as well as eight transitions of the 34S12C19F2 isotopomer with J between 0 and 9, have been assigned. The rotational constants and quartic centrifugal distortion constants have been determined. A 19F nuclear spin-rotation interaction, as well as a rather large direct 19F nuclear spin–spin interaction, have been observed. The three diagonal elements of the spin-rotation tensor at the 19F nuclei have been determined to be Maa=22.9(9) kHz, Mbb=10.4(4) kHz, and Mcc=5.4(3) kHz for 32S12C19F2 and Maa=20.9(9) kHz, Mbb=10.7(4) kHz, Mcc=6.4(4) kHz for 34S12C19F2, respectively. For 32S13C19F2, seven transitions with J between 0 and 6 have been assigned and rotational constants and two quartic centrifugal distortion constants have been derived. The splitting patterns due to the two 19F nuclei and the 13C nucleus have been observed but not completely resolved. A ground-state average structure has been determined for 32S12C19F2 as rz(CS)=1.5870(20) A(ring), rz(CF)=1.3182(13) A(ring), and (arc left)(FCF)=106.89(11)°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462932
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  • 4
    Electronic Resource
    Electronic Resource
    Microwave spectra of metal chlorides produced using laser ablation (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 3320-3328 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An apparatus has been constructed to produce metal compounds using laser ablation and to investigate their rotational spectra with a microwave Fourier transform (MWFT) cavity spectrometer. The first three such compounds that have been studied are silver chloride, aluminum (I) chloride, and copper (I) chloride, produced by ablation of silver, aluminum, and copper rods in the presence of chlorine gas, using a Q-switched Nd:YAG laser (532 nm). The high resolution and sensitivity available with the MWFT cavity spectrometer have permitted the first determination of nuclear spin–rotation coupling constants for AlCl and CuCl. These constants have been used to examine the electronic structures of the molecules. Values of the rotational and nuclear quadrupole coupling constants have also been improved for the three metal chlorides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465141
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  • 5
    Electronic Resource
    Electronic Resource
    Pure rotational spectra of the mixed rare gas van der Waals complexes Ne–Xe, Ar–Xe, and Kr–Xe (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 919-927 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Pure rotational transitions in the vibrational ground states of various isotopomers of the heteronuclear rare gas dimers Ne–Xe, Ar–Xe, and Kr–Xe have been measured using a pulsed molecular beam cavity microwave Fourier transform spectrometer. Rotational and centrifugal distortion constants have been obtained, and have yielded estimates of the lengths of the van der Waals bonds and of their harmonic vibration frequencies. Effects due to nuclear quadrupole coupling have been observed in 131Xe-containing complexes and have yielded the corresponding nuclear quadrupole coupling constants. The electric molecular dipole moments of the complexes have been estimated from the excitation pulse lengths, optimized for maximum signal strength (π/2 condition).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465356
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  • 6
    Electronic Resource
    Electronic Resource
    The microwave rotational spectrum of the Ar–CO dimer (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 9399-9404 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Pure rotational spectra of four different isotopomers of the dimer Ar–CO have been investigated between 8 and 18 GHz using a pulsed beam cavity Fourier transform spectrometer. The spectra confirm that the complex is a prolate near-symmetric rotor with an essentially T-shaped structure, and that it undergoes large amplitude zero-point motion. It is shown that on the average the argon is closer to the oxygen than to the carbon. The transitions measured obey a-type selection rules with ΔJ=+1, ΔKa=0, and ΔKc=+1. For 40Ar–12C16O, transitions have been observed for Ka=0 and 1 with lower state J values of 1, 2, and 3. For 40Ar–13C16O and 40Ar–13C18O, a similar series was measured, but only for Ka=0. For 40Ar–13C17O, the 17O quadrupole hyperfine pattern was resolved in the rotational transition JKaKc = 202–101. Determinations have been made for rotational and centrifugal distortion constants, as well as for the 17O quadrupole coupling constant χaa. Effective values have been obtained for the length of the line from the center of mass of the CO subunit to the argon nucleus, and for the angle between this line and the CO bond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464371
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  • 7
    Electronic Resource
    Electronic Resource
    The microwave spectrum, structure, and harmonic force field of the van der Waals trimer Ar2–OCS (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 2735-2741 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The microwave rotational spectra of the van der Waals trimers Ar2–OCS, Ar2–OC34S, and Ar2–18OCS have been observed between 7.0 and 18.0 GHz using pulsed molecular beam microwave Fourier transform (MWFT) spectroscopy. Sixty-five transitions, both a and c type, have been assigned for Ar2–OCS, as well as 37 transitions and 19 transitions for Ar2–OC34S and Ar2–18OCS, respectively. The rotational constants and quartic centrifugal distortion constants have been determined. The trimer has been found to be a distorted tetrahedrally shaped highly asymmetric top (κ=∼0.377) with the OCS subunit lying in the Cs symmetry plane. An effective ground state structure has been determined. The Ar–Ar distance and the two "Ar–center of mass of OCS'' distances are slightly longer than those in the corresponding dimers Ar2 and Ar–OCS, respectively. A harmonic force field analysis has been performed on the basis of the centrifugal distortion constants, to predict the van der Waals force constants and the corresponding vibrational frequencies. The Ar–Ar stretch force constant of the trimer is 0.008 42 mdyn A(ring)−1, which compares favorably with 0.0078 mdyn A(ring)−1 reported for the free dimer Ar2. A comparison of the geometry and spectroscopic properties of Ar2–OCS with those of Ar2 and of the Ar2–HX (X=F, Cl, CN) trimers is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464155
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  • 8
    Electronic Resource
    Electronic Resource
    The microwave rotational spectrum of the van der Waals complex Kr–N2 (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 7510-7520 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Pure rotational transitions in the vibrational ground state of the van der Waals complex Kr–N2 have been measured using a cavity microwave Fourier transform spectrometer. For the isotopomers 84Kr–14N2, 86Kr–14N2, 84Kr–15N2, 86Kr–15N2, 82Kr–15N2, and 83Kr–15N2 a-type transitions with Ka=0 and 1 have been measured, confirming a C2v symmetry of the complex. A value for the 14N nuclear quadrupole coupling constant in free nitrogen 14N2 has been estimated from an analysis of the nuclear hyperfine structure in complexes of 14N2. 15N spin–rotation hyperfine structure could be observed and analyzed in the 21,2–11,1 and 21,1–11,0 rotational transitions of 84Kr–15N2. Rotational transitions of 83Kr–15N2 showed a nuclear hyperfine splitting due to 83Kr with nuclear spin 9/2 which has been attributed to the weak bonding with 15N2. For 84Kr–14N15N and 86Kr–14N15N, only transitions involving energy levels with Ka=0 have been found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465681
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  • 9
    Electronic Resource
    Electronic Resource
    Rotational spectrum, structure, and chlorine nuclear quadrupole coupling constants of the van der Waals complex Ar–Cl2 (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 3726-3731 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The pure rotational spectrum of the van der Waals complex Ar–Cl2 has been observed between 5 and 14 GHz using a Balle–Flygare type pulsed molecular beam microwave Fourier transform spectrometer. Ten a-type rotational transitions of Ar–35Cl2, as well as five a-type rotational transitions of the mixed isotopomer Ar–35Cl37Cl, have been assigned. The rotational constants and quartic centrifugal distortion constants have been determined. Unlike its isovalent linear isomer Ar–ClF, Ar–Cl2 has been found to be a T-shaped complex. This confirms the result from electronic spectroscopy and is in accord with the atom–atom additive model. The distance from the Ar nucleus to the center of mass of the Cl2 subunit has been calculated to be 3.7190 A(ring) for Ar–35Cl2 and 3.7184 A(ring) for Ar–35Cl37Cl, respectively. The van der Waals stretch and bend force constants, as well as their corresponding harmonic vibrational frequencies, have been derived and compared with the theoretically predicted values. The nuclear hyperfine splittings due to the two chlorine nuclei have been resolved and the coupling constants have been accurately determined. For 35Cl these are (in MHz): χaa=54.8180(16), χbb=−110.7131(19), χcc=55.8951(19) in Ar–35Cl2; and χaa=54.8407(27), χbb=−110.706(20), χcc=55.866(20) in Ar–35Cl37Cl. For 37Cl the values are χaa=43.2111(29), χbb=−87.267(12), χcc=44.056(12) in Ar–35Cl37Cl. A value has been obtained for the nuclear quadrupole coupling constant in free diatomic chlorine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464050
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  • 10
    Electronic Resource
    Electronic Resource
    A precise calibration system for high-resolution visible-laser spectroscopy (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1003-1007 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A method for calibrating high-resolution laser spectra in the visible is described. The system is based on an evacuated Fabry–Perot étalon whose cavity length is servolocked to a stabilized HeNe laser; the absolute order number of the fringe at the HeNe frequency is known and the free spectral range can be determined with high accuracy. For absolute-frequency measurements the order number of a transmission fringe is obtained from a commercial wavemeter (whose accuracy is sufficient to identify the fringe); the absolute frequency is then the HeNe frequency multiplied by the ratio of the "unknown'' order number to the "lock-point'' order number. The long-term frequency reproducibility of the system is better than 25 MHz. Small-frequency splittings such as molecular hyperfine intervals can be measured to ±1 MHz, while large-frequency intervals (of the order of 500 GHz) are consistent to better than 10 MHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140307
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