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Deexcitation of He(2 1P) in a collision with a hydrogen molecule (1991)

Morishima, Y. ; Yoshida, H. ; Ukai, M. ; [et al.]

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 94 (1991), S. 2564-2570

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ISSN: 1089-7690

Source: AIP Digital Archive

Topics: Physics , Chemistry and Pharmacology

Notes: Deexcitation cross sections of He(2 1P) by H2 have been measured using a pulse radiolysis method in a region of the mean collisional energy between 18 and 38 meV and compared with those obtained by theoretical calculations. Experimental cross-section values and their collisional energy dependence are interpreted in terms of the Penning ionization cross section based on a long-range dipole–dipole interaction between He(2 1P) and H2. Validity of the theoretical formula for the Penning ionization cross section, i. e., the Watanabe–Katsuura formula, is discussed. The cross section has been further calculated by means of an impact-parameter method with experimentally simulated classical trajectories; a hydrogen molecule has been assumed to be spherical to neglect the rotational effect of H2; it is also assumed that the polarization axis of the p-state helium rotates in order to keep collinear or perpendicular configuration with respect to the axis of He–H2. A modified form of the dipole–dipole autoionization width with an electron exchange interaction is also discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.459884

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Photoionization of argon, krypton and xenon clusters in the inner valence shell region (1998)

Thissen, R. ; Lablanquie, P. ; Hall, R.I. ; [et al.]

Springer

The European physical journal 4 (1998), S. 335-342

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ISSN: 1434-6079

Keywords: PACS. 36.40.-c Atomic and molecular clusters - 36.40.Wa Charged clusters

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: Photoionization of rare gas clusters in the innervalence shell region has been investigated using threshold photoelectron and photoion spectrometers and synchrotron radiation. Two classes of states are found to play an important role: (A) valence states, correlated to dissociation limits involving an ion with a hole in its innervalence ns shell, (B) Rydberg states correlated to dissociation limits involving an ion with a hole in its outervalence np shell plus an excited neutral atom. In dimers, class A states are “bright”, that is, accessible by photoionization, and serve as an entrance step to form the class B “dark” states; this character fades as the size of the cluster increases. In the dimer, the “Mulliken” valence state is found to present a shallow potential well housing a few vibrational levels; it is predissociated by the class B Rydberg states. During the predissociation a remarkable energy transfer process is observed from the excited ion that loses its innershell electron to its neutral partner.