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  • 1
    Electronic Resource
    Electronic Resource
    Marked matrix effect on spin polarization of biacetyl 3n.pi. state in low-temperature matrixes (1985)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 4921-4925 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100269a008
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  • 2
    Electronic Resource
    Electronic Resource
    Direct detection of spin-polarized ESR spectra of biacetyl n.pi.* triplet states in organic matrixes at 77 K (1982)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 86 (1982), S. 3279-3281 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100214a003
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  • 3
    Electronic Resource
    Electronic Resource
    Conservation of spin-polarization during triplet-triplet energy transfer in low-temperature matrixes (1984)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 88 (1984), S. 4028-4031 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150662a033
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  • 4
    Electronic Resource
    Electronic Resource
    Negative-ion mass spectrometric study of ion-pair formation in the vacuum ultraviolet. V. CF4→F−+CF+3 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 2398-2406 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ion-pair formation from photoexcitation of CF4 has been studied by negative-ion mass spectrometry using synchrotron radiation in the 11–31 eV photon energy range. Negative F− ions have been observed. The appearance energy in the F− photodissociation efficiency curve is about 2 eV higher than the thermochemical threshold for the formation of the ground-state ions F−(1Sg) and CF+3(X˜ 1A'1). The peak features observed in the spectrum are interpreted as resulting from transitions to Rydberg states with the 1T2 symmetry. Assignments of the peaks have been made on the basis of the previous work on photoabsorption cross-section curves of CF4. Repulsive Rydberg states converging to CF+4(X˜ 2T1, A˜ 2T2) give the strong and broad peaks in the F− efficiency curve. Conversion to the ion-pair state is considered to occur through the avoided potential surface crossings along the dissociation coordinate of the CF3—F bond. In contrast, the npt2 Rydberg states (n≥4) converging to CF+4(C˜ 2T2) show long vibrational progressions. The radiative and nonradiative decay pathways for these Rydberg states are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461782
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  • 5
    Electronic Resource
    Electronic Resource
    Negative-ion mass spectrometric study of ion pair formation in the vacuum ultraviolet. I. N2O→O−+N+2 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 6556-6560 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Negative ion formation from N2O has been studied using synchrotron radiation in the 15–40 eV photon energy range. Only O− ion signal is observed by mass spectrometry. The onset of the photodissociation efficiency curve for O− from N2O is in good agreement with the thermochemical threshold of 15.79 eV for the formation of O−(2Pu)+N+2(X˜ 2∑+g). Several series of peaks are identified as resulting from predissociation from the Rydberg states converging to N2O+(A˜ 2∑+, B˜ 2∏, and C˜ 2∑+). In particular, two Rydberg series (ndσ and ndπ) converging to the C˜ state are observed most prominently.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458291
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  • 6
    Electronic Resource
    Electronic Resource
    Negative-ion mass spectrometric study of ion-pair formation in the vacuum ultraviolet. VI. CH3X→X−+CH+3 (X=F, Cl, Br) (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7500-7505 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ion-pair formation from photoexcited halomethanes, CH3X*→X−+CH+3 (X=F, Cl, Br) has been studied by measuring photodissociation efficiency curves of X− using synchrotron radiation in the 9.9–27.5 eV photon energy range. A new spectral feature is observed in each of the curves near the threshold for the removal of an na1 electron from CH3X (n=4, 6, and 8, respectively, for CH3F, CH3Cl, and CH3Br ). This feature, composed of two or three peaks in each case, is interpreted as resulting from photoexcitation to the Rydberg states converging to CH3X+(C˜ 2A1), which then predissociate into ion pairs through avoided potential energy surface crossings. The interpretation is based on the results of the inner-shell electron energy loss study by Brion and co-workers and the photoabsorption study by Hochmann and co-workers. Peak features are also observed in the X− efficiency curves near the ionization threshold for CH3X+(X˜ 2E). The origins of these peaks are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462401
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  • 7
    Electronic Resource
    Electronic Resource
    Negative-ion mass spectrometric study of ion-pair formation in the vacuum ultraviolet. IV. CH4→H−+CH+3 and CD4→D−+CD+3 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 6003-6006 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ion-pair formation from photoexcited methanes, CH@B|4 →H− +CH+3 and CD*4 →D− +CD+3, has been studied by measuring the efficiency curves of H− and D− using synchrotron radiation. Ion pairs are produced both by direct dissociation and predissociation of the npt2 (n=3–5) Rydberg state converging to the A˜ 2A1 state of CH+4/ CD+4. The 4pt2 and 5pt2 Rydberg states are observed here for the first time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460435
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  • 8
    Electronic Resource
    Electronic Resource
    Dissociative single, double, and triple photoionization of silicon tetrafluoride in the valence shell and silicon 2p regions (hν=33–133 eV) (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 4936-4948 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoionization of SiF4 in the valence shell and Si2p innershell regions has been studied using time-of-flight mass spectrometry and synchrotron radiation over the photon energy range 33–133 eV. Photoionization branching ratios are reported for stable singly and doubly charged ions arising from the various possible molecular and dissociative photoionization processes. The time-of-flight mass spectrometer used in the present work employs very efficient ion extraction fields and this results in very much higher relative abundances of energetic fragmentations than were reported in earlier published work [Lablanquie et al., J. Chem. Phys. 90, 7078 (1989)]. Photoion–photoion coincidence (PIPICO) techniques have been used to investigate the relative yields of Coulomb explosion decomposition products and threshold energies for dissociative double photoionization in the valence shell and silicon 2p regions. The dominant process in the Si2p region is (F++Si+). The PIPICO spectra show additional peaks with thresholds in the Si2p region and these structures arise from the dissociation of triply charged ions into the exit channels (F++SiF2+2), (F++SiF2+) and (F++Si2+). Of these the latter is the most probable process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460579
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  • 9
    Electronic Resource
    Electronic Resource
    Negative-ion mass spectrometric study of ion-pair formation in the vacuum ultraviolet. II. OCS→S−+CO+, O−+CS+, and CO2→O−+CO+ (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 1710-1719 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ion-pair formation from photoexcitation of OCS and CO2 has been studied by negative-ion mass spectrometry using synchrotron radiation in the 15–35 eV photon energy range. Negative ions S− and O− from OCS and O− from CO2 have been observed. The lowest onset energy in the photodissociation efficiency curve for each ion is in good agreement with the thermochemical threshold for the formation of the negative ion in the ground 2Pu state and its counterpart positive ion in the ground 2Σ+ state. There exist series of peaks with medium intensities in the efficiency curves of S− from OCS and O− from CO2; they are identified as resulting from predissociation of the Rydberg states converging to OCS+(B˜ 2Σ+) and CO+2(C˜ 2Σ+g), respectively. Broad peaks are observed at 18.4 eV (∼675 A(ring)) in the efficiency curves for both S− and O− produced from OCS. Predissociation of the excited valence state formed by the intravalence 9σ→10σ transition is considered to mainly contribute to these features. In addition, a broadband feature is present in the wavelength range of 400–620 A(ring) in the O− efficiency curve. The most likely candidate for the corresponding doorway state is the two-electron excited state involving simultaneous 9σ→10σ and 3π→4π transitions. In the case of the O− efficiency curve from CO2, two maxima observed at 21.4 (580 A(ring)) and 23.0 eV (538 A(ring)) are explained as resulting from the 3σu→5σg transition forming an excited valence state which effectively couples to the ion-pair continuum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459098
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  • 10
    Electronic Resource
    Electronic Resource
    Negative-ion mass spectrometric study of ion-pair formation in the vacuum ultraviolet. III. SF6→F−+SF+5 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 8717-8724 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ion-pair formation from photoexcitation of SF6 has been studied by negative-ion mass spectrometry using synchrotron radiation in the 11.27–31.0 eV photon energy range. Negative ions F−, SF−6, and SF−5 have been observed. The appearance energy of the F− ion is about 1 eV higher than the thermochemical threshold for the formation of the pair of the ground state ions F−(1Sg) and SF+5(X˜1A1). The peak features observed in the F− efficiency curve are interpreted as resulting from transitions to neutral excited states with the 1T1u symmetry which effectively couple with ion-pair states through avoided potential surface crossings. The peaks assigned to diffuse Rydberg states are distinctively enhanced in the F− efficiency curve, probably because of large transition probabilities from the dissociative Rydberg states to the ion-pair states. In contrast, the excited states of valence type autoionize in a short period and have quite small branching to the ion-pair channel. Consequently, the corresponding peaks are markedly suppressed in the F− spectrum. Assignments of the peak features in the previous photoabsorption spectra are also performed by using the term values for related Rydberg and virtual valence orbitals. Other negative ions observed, SF−6 and SF−5, are produced by resonance capture of low energy electrons emitted by photoionization of the parent molecules, and are not of major concern of the present study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459259
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