Molecular beam photoionization study of OCS, (OCS)/sub 2/, (OCS)/sub 3/, and OCSxCS/sub 2/

Journal Article · Sun Feb 01 04:00:00 EST 1981 · J. Chem. Phys.; (United States)

OSTI ID:6836667

Ono, Y; Osuch, E A; Ng, C Y

Photoionization efficiency (PIE) data for OCS/sup +/ near the threshold (1080--1111 A) were obtained with a resolution of 0.14 A (FWHM) using the molecular beam method. The ionization energies (IE) for the /sup 2/Pi/sub 3/2/ and /sup 2/Pi/sub 1/2/ states of OCS were determined to be 11.1736 +- 0.0015 eV (1109.62 +- 0.15 A) and 11.2204 +- 0.0015 eV (1104.95 +- 0.15 A), respectively. These values are found to be in agreement with those obtained in previous photoionization experiments. PIE data for (OCS)/sub 2/, (OCS)/sub 3/, and OCSxCS/sub 2/ have also been obtained in the wavelength region 750--1270 A. The observed IE's for (OCS)/sub 2/, (OCS)/sub 3/, and OCSxCS/sub 2/ are 10.456 +- 0.026, 10.408 +- 0.026, and 9.858 +- 0.024 eV, respectively. From the measured IE's and the estimated dissociation energies of (OCS)/sub 2/ and OCSxCS/sub 2/, the binding energies for OCS/sup +/xOCS and CS/sup +//sub 2/xOCS are deduced to be 17.2 +- 1 and 5.8 +- 1 kcal/mol, respectively. From the shifts in energy of the Rydberg series of CS/sub 2/ and OCS in the OCSxCS/sub 2/ and (OCS)/sub 2/ dimers, and from the symmetry of the Rydberg orbitals, possible geometries for OCSxCS/sub 2/ and (OCS)/sub 2/ are discussed.

• Research Organization: Ames Laboratory, U.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011
• OSTI ID: 6836667
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 74:3; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
BEAMS
CARBON COMPOUNDS
CARBON OXYSULFIDE
CARBON SULFIDES
CHALCOGENIDES
DIMERS
DISSOCIATION ENERGY
ELECTROMAGNETIC RADIATION
ENERGY
FAR ULTRAVIOLET RADIATION
IONIZATION
MOLECULAR BEAMS
PHOTOIONIZATION
RADIATIONS
SPECTRA
SULFIDES
SULFUR COMPOUNDS
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA