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See detailThe Absorption Spectrum and the Threshold- and CIS-photoelectron Spectra of CS2.
Locht, Robert ULg; Hottmann, K.; Denzer, W. et al

Book published by Elektronen Speicherring für Synchrotron Strahlung m.b.H (1993)

Using synchrotron radiation the VUV photoabsorption, the threshold photoelectron and the CIS-photoelctron spectra are measured between 9.9-17.9 eV and are briefly discussed.

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See detailThe Threshold Photoelectron Spectrum of NH3.
Locht, Robert ULg; Hottmann, K.; Hagenow, G. et al

in Chemical Physics Letters (1992), 190(1,2), 124-129

Using synchrotron radiation, we have investigated the threshold photoelectron spectrum of NH3 between 10-30 eV photon energy. In contrast to the He(I)-photoelectron spectrum, the threshold photoelectron ... [more ▼]

Using synchrotron radiation, we have investigated the threshold photoelectron spectrum of NH3 between 10-30 eV photon energy. In contrast to the He(I)-photoelectron spectrum, the threshold photoelectron spectrum shows three bands between 10 and 21 eV. The first band is dominated by the vibrational autoionization of the 5a1, the 6a1 and the 6pe Rydberg series. Between the first and second bands a new contribution, starting at 13.26 eV, is assigned to the autoionization of (a) member(s) of Rydberg series converging to the e-1 ionization continuum. Its (their) autoionization populates the upper vibrational levels of the NH3+ (X2A1) state. From about 14.5 eV the A2E band structures are identified. However, differences between the A2E band shapes in the He(I)- and the threshold photoelectron spectra suggest that very likely autoionization contributions are involved in the latter spectrum. These phenomena could play a role in the production of the NH2+ and NH+ fragment ions. The last very weak band, at about 25 eV in the photoelectron spectrum is assigned to the NH3+(B2A1) state. [less ▲]

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See detailPhotoionization Mass Spectrometry of Kinetic Energy-selected ions. The Translational Energy Distribution of N+/N2 in the Inner-shell Ionization energy range.
Locht, Robert ULg; Denzer, W.; Rühl, E. et al

in Chemical Physics (1992), 160

An ion retarding potential difference (IRPD) method has been used to investigate the ion yield and the kinetic energy distributions of N+/N2 produced by photoionization mass spectrometry using synchrotron ... [more ▼]

An ion retarding potential difference (IRPD) method has been used to investigate the ion yield and the kinetic energy distributions of N+/N2 produced by photoionization mass spectrometry using synchrotron radiation. Photoion yield curves of energy selected N+ ions are deduced. Translational energy distributions of N+ at the energies of the N(1s)->pi*, N(1s)->(nl)1 and above the N(1s)-1 threshold are determined. Comparison is made with previous photoion-photoelectron coincidence work using time-of-flight (TOF) measurements. [less ▲]

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See detailIon Translational Energy Distributions from Inner-shell Dissociative ionization of N2O, NH3 and SF6.
Locht, Robert ULg; Leyh, Bernard ULg; Jochims, H. W. et al

Book published by Berliner Elektronen Speicherring für Synchrotron Strahlung m.b.H (1992)

The IRPD method is applied to the dissociative ionization in the inner-shell ionization region for NO+, N2+, O+, N+ and N++/N2O. Particular attention has been focussed on the production and ion kientic ... [more ▼]

The IRPD method is applied to the dissociative ionization in the inner-shell ionization region for NO+, N2+, O+, N+ and N++/N2O. Particular attention has been focussed on the production and ion kientic energy distribution of H+/NH3. [less ▲]

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See detailPhotoionization of NH3 and its Isotopomers between 10 and 12 eV.
Locht, Robert ULg; Leyh, Bernard ULg; Denzer, W. et al

in Kistemaker, P. G.; Nibbering, N. M. (Eds.) Advances in Mass Spectrometry: Proceedings of the 12th IMSC, Amsterdam (International Mass Spectrometry Conference 26-30 August 1991): Book of Abstracts. (1991)

The photoionization of NH3 and its isotopomers is measured between 10-12 eV photon energy by using synchrotron radiation. The abundant autoionization structure observed in the ionization efficiency curves ... [more ▼]

The photoionization of NH3 and its isotopomers is measured between 10-12 eV photon energy by using synchrotron radiation. The abundant autoionization structure observed in the ionization efficiency curves is analyzed. [less ▲]

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See detailVibrational Autoionization in NH3 and its Isotopomers in the 10-12 eV photon energy range.
Locht, Robert ULg; Leyh, Bernard ULg; Denzer, W. et al

in McCarthy, I. E.; MacGillivray, W. R.; Weigold, E. (Eds.) et al 17th International Conference on the Physics of Electronic and Atomic Collisions. Book of Abstracts. (1991)

The observation and detailed analysis of the vibrational autoionization in NH3 and its three isotopomers is reported.

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See detailVibrational Autoionization in NH3 and its Isotopomers in the 10-12 eV photon energy range.
Locht, Robert ULg; Leyh, Bernard ULg; Denzer, W. et al

in MacGillivray, W. R.; McCarthy, I. E.; Standage, M. C. (Eds.) ICPEAC Abstracts (International Conference on the Physics of Electronic and Atomic Collisions) (1991)

The photoionization efficiency curves of the four isotopomers of NH3 have been recorded using synchrotron radiation. The abundant fine structure has been interpreted in terms of vibrational structure of ... [more ▼]

The photoionization efficiency curves of the four isotopomers of NH3 have been recorded using synchrotron radiation. The abundant fine structure has been interpreted in terms of vibrational structure of Ryberg series which autoionize. [less ▲]

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See detailThe Photoionization of Ammonia revisited. The Vibrational Autoionization of NH3 and its three Isotopomers in the 10-12 eV photon energy range.
Locht, Robert ULg; Leyh, Bernard ULg; Denzer, W. et al

in Chemical Physics (1991), 155

The photoionzation efficiency curves of NH3 and its three isotopomers have been investigated in the photon energy range of the first ionized state. From the analysis of the corresponding vibrational ... [more ▼]

The photoionzation efficiency curves of NH3 and its three isotopomers have been investigated in the photon energy range of the first ionized state. From the analysis of the corresponding vibrational structure, wavenumbers and anharmonicity constants are deduced. The detailed investigation of the abundant autoionization structure tends to show the adiabatic ionization energy to be 10.072+/-0.010 eV for NH3, NH2D and NHD2 and 10.083+/-0.010 eV for ND3. All autoionization features were classified in vibrational progressions (nu2 bending mode) belonging to nasa1 (or nd) and npe (n=5, 6, 7) Rydberg series. Vibrational autoionization occurs through Delta v transitions up to -9. A qualitative analysis of the intensity distribution of these series strongly supports that transitions involving odd Delta v values are favoured. This observation can be understood by applying group theoretical considerations to the theory of vibrational autoionization. [less ▲]

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See detailThe Photoionization of Ammonia Revisited. The Autoionization in NH3 and its three Isotopomers in the 10-12 eV photon energy range.
Locht, Robert ULg; Leyh, Bernard ULg; Denzer, W. et al

Book published by Berliner Elektronen Speicherring für Synchrotron Strahlung m.b.H (1990)

The photoionization efficiency curves of NH3, NH2D, NHD2 and ND3 have been measured using synchrotron radiation. The fine structure has been interpreted in terms of vibrational autoionization.

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See detailThe Threshold Photoelectron Spectrum of NH3 in the 10-31 eV photon energy range.
Locht, Robert ULg; Hottmann, K.; Denzer, W. et al

Book published by Berliner Elektronen Speicherring für Synchrotron Strahlung m.b.H (1990)

The measurement of the threshold photoelectron spectrum of NH3 by using synchrotron radiation is reported for the first time. Several new bands are highlighted.

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See detailAbout the Double Ionization of NH3 and CO2. A Comparison between Photoionization and Electron Impact.
Locht, Robert ULg; Servais, Christian ULg; Davister, M. et al

in Dalagarno, A.; Freund, R. S.; Lubell, M. S. (Eds.) et al 16th Internatioanl Conference on the Physics of Electronic and Atomic Collisions: Abstracts of Contributed Papers. (1989)

Using synchrotron radiation the double ionization of NH3 and CO2 is measured. The results are compared with those obtained by electron impact.

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See detailAbout the Double Ionization of Ammonia and Carbon Dioxide. A Comparison between Photoionization and Electron Impact.
Locht, Robert ULg; Davister, M.; Denzer, W. et al

in Chemical Physics (1989), 138

The double ionization of NH3 and CO2 is investigated by photoionization in the 30-60 eV photon energy range and electron impact from 30-100 eV. The lowest onset for (NH3)2+ formation, measured for the ... [more ▼]

The double ionization of NH3 and CO2 is investigated by photoionization in the 30-60 eV photon energy range and electron impact from 30-100 eV. The lowest onset for (NH3)2+ formation, measured for the first time by photoionization, is at 34.5+/-0.2 eV. By electron impact this threshold is 34.8+/0.2 eV. For (CO2)2+ this onset is measured at 37.5+/-0.1 eV by photoionization and at 38.0+/-0.1 eV by electron impact. Close to these onsets two double ionization energies are observed: 38.5+/-0.1 eV by photoionization and 39.5+/-0.2 eV by electron impact. These have probably to be ascribed to two different (CO2)2+ states. Higher-lying doubly ionized states of CO2 are detected in the 60-100 eV electron impact energy range. [less ▲]

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See detailThe Dissociative Photoionization of Ammonia. The Formation of NH2+, NH+ and N+.
Locht, Robert ULg; Hagenow, G.; Denzer, W. et al

Book published by Berliner Elektronen Speicherring für Synchrotron Strahlung m.b.H. (BESSY) (1988)

The dissociative ionization of NH3 has been investigated by photoionization using synchrotron radiation. Appearance energies and the kinetic energy of NH2+, NH+ and N+ are reported.

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See detailAbout the Double Ionization of NH3 and CO2. A Comparison between Photoionization and Electron Impact.
Locht, Robert ULg; Davister, M.; Momigny, J. et al

Book published by Berliner Elektronen Speicherring für Synchrotron Strahlung m.b.H. (BESSY) (1988)

The photoionization efficiency curves of (NH3)2+ and (CO2)2+ have been recorded and threshold energies have been measured. The results are compared with those obtained by electron impact.

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