802EIlCHI HANAMURA may be modified by stretching vibrations. If this modification is stronger than the deviation of the stretching vibrations from the adiabatic approximation, it will have stronger Raman scattering than other stretching vibrations which do not participate in modification of charge transfer. This effect has been observed by Ito et at. in the ICI crystal. 20On the basis of these theoretical results, it is thus concluded that Raman scattering is a useful device for studying the details of the charge-transfer mechanism.The photoelectron spectra of ethylene and ethylene-d4 have been measured using a new high-resolution spectrometer and the 584-A helium resonance line as a light source. Five ionization potentials have been observed for each compound. Vibrational structure associated with the transitions leading to the first and fourth ionization potentials has been resolved, and it has been possible to assign the corresponding vibrational modes. The photoelectron spectrum of neon, obtained with the 537-A line from the same light source, is also presented.

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The photoelectron spectra of ethylene, ethylene-d4, ammonia, and ammonia-d3 have been measured using a hemispherical high resolution electrostatic spectrometer and the 584 MATHS SYMBOL helium resonance line as the exciting radiation. Many ionization potentials have been determined for each compound and vibration structure associated with the transitions leading to the various ionization potentials has in many cases been well resolved. It has been possible to suggest reasonable assignments for the corresponding vibrational modes. The photoelectron spectra of MATHS FORMULA obtained using neon radiation (736 and 744 MATHS SYMBOL) shows a progression of twenty-one vibrational transitions, with maxima at v = 1 and v = 7. This is larger than the number of vibrational transitions observed with the 584 MATHS SYMBOL helium line and it is postulated that the extra structure observed arises from ionization processes from a long-lived excited state of oxygen.

NOBUYUKI KIKUKAWA and TSUTOMU MAKITA. Can. J. Chem. 66, 1857 (1988.The thermoluminescent phosphor, calcium sulfate activated by manganese, was found to be a suitable material for imaging films to record the spatial distributionsoand reflections of vacuum ultraviolet (vuv) photon beams used for high-resolution photoelectron spectrometers. He I 584 A photons radiated in a microwave discharge tube were collimated through capillary tubes, and the phosphor films were placed at the position of the photoionization chamber. When the irradiated phosphor films were heated up to 200°C in a darkroom, faint green glow images were observable on the phosphor films and these images were recorded by photographic films. When the films were placed 11 8 mm from the exit of the collimating capillary tube, the photon beam images were almost circular, about 4.5 mm in diameter. The photon distribution in the collimated beam was interpreted with the aid of computer simulation. The experimental results revealed that the reflections of vuv photons at planes of various kinds were almost specular if the surface was clean and smooth and the glancing angles were small. Nosu~uKr KIKUKAWA et TSUTOMU MAKITA. Can. J. Chem. 66, 1857Chem. 66, (1988.On a trouvk que le sulfate de calcium activk par le mangankse, un produit phosphorescent et thermoluminescent, est un produit utile pour faire des films desquels on peut tirer des images permettant d'enregistrer les distributions spatiales et les rkflexions des faisceaux de photons ultraviolet sous vide (uvv) qui sont utilisks dans les spectromktres photoklectroniques a haute rksolution.On a dirigk les photons du He I 584 A qui proviennent d'une radiation dans un tube a dtcharge a micro-ondes vers des tubes capillaires servant de collimateur et on a place les films phosphorescents ii la place de la chambre a photoionisation. Lorsque les films phosphorescents irradiks ont kt6 chauffks a 200°C, dans un chambre noire, on a pu observer de faibles lueurs d'images vertes que I'on a enregistrk images sur des films photographiques. Lorsqu'on place les films 5 118 mm de la sortie du tube capillaire agissant cornrne collimateur, les images du faisceau de photons sont pratiquement circulaires, avec un diamktre d'environ 4,5 mm. On a interpritk la distribution des photons dans le faisceau qui a pass6 au collimateur en faisant appel a une simulation par ordinateur. Les rksultats exptrimentaux suggkrent que les rkflexions des photons (uvv) sur divers types de plans sont pratiquement sptculaires si la surface est lisse et propre et que les angles de percement sont faibles.[Traduit par la revue]

The mass spectra of DCOOD, DCOOH, CD3COOD, CD3COOH, CH3COOD, C2H5COOD, and C3H7COOD are compared with spectra of the H-containing compounds. Besides, the 18O-labeled acetic acid is measured.The labeling helps to determine the origin of a number of fragment ions. It is found that the two fragment ions C3H5O2+ and C4H7O2+ are produced by the removal of the hydrogen atom from the alkyl group and have the structures of C2H4CO2H+ and C3H6CO2H+ respectively.Neither CH2CO2H+ nor CH3CO2+ is produced.The rerrangement ion CH3O+ is found to have the structure of CH2OH+, one of whose hydrogen atoms comes from the carboxyl group.The origins of the hydrogen atom and the oxygen atom in the other rearrangement ions are also determined. The mechanisms for the fragmentation of the molecular ions are discussed.