Photoionization studies of the Kr/sub 2/ and Ar/sub 2/ van der Waals molecules. [Ionization potential, photoion yield, au]

Journal Article · Sat Jan 15 00:00:00 EST 1977 · J. Chem. Phys.; (United States)

OSTI ID:7335987

Ng, C Y; Trevor, D J; Mahan, B H; Lee, Y T

The photoionization efficiency curves of the Kr/sub 2/ and Ar/sub 2/ van der Waals dimers were obtained with the molecular beam technique in the wavelength ranges 850--965 A (12.848--14.586 eV) and 750--855 A (14.501--16.531 eV), respectively. The ionization potential of Kr/sub 2/ was found to be 12.87 +- 0.015 eV (963.7 +- 1.2 A), which agrees with the value obtained by Samson and Cairns. The ionization potential of Ar/sub 2/ was found to be 14.54 +- 0.02 eV (852.7 +- 1.2 A). Using the known ground state dissociation energies of Kr/sub 2/ and Ar/sub 2/, the dissociation energy of Kr/sup +//sub 2/, D/sub 0/(Kr/sup +//sub 2/), is deduced to be 1.15 +- 0.02 eV and that for Ar/sup +//sub 2/, D/sub 0/(Ar/sup +//sub 2/), is 1.23 +- 0.02 eV. The photoion yield curves of Kr/sub 2/ and Ar/sub 2/ are compared with that of Xe/sub 2/. Prominent autoionization structure was observed to correspond to Rydberg molecular states which are derived from the combination of a normal and an excited atom in the 4p/sup 5/ns (or 4p/sup 5/nd) configuration for Kr and 3p/sup 5/ns (or 3p/sup 5/nd) configuration for Ar. (AIP)

• Research Organization: Materials and Molecular Research Division, Lawrence Berkeley Laboratory and Department of Chemistry, University of California, Berkeley, California 94720
• OSTI ID: 7335987
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 66:2; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
AUTOIONIZATION
DIMERS
ELEMENTS
INTERATOMIC FORCES
IONIZATION
IONIZATION POTENTIAL
KRYPTON
NONMETALS
PHOTOIONIZATION
RARE GASES