New vibrational assignments for the autoionization bands of O/sub 2/ based on isotope shifts

Journal Article · Mon Oct 15 04:00:00 EDT 1984 · J. Chem. Phys.; (United States)

OSTI ID:6408379

Nishitani, E; Tanaka, I; Tanaka, K; Kato, T; Koyano, I

The relative photoionization efficiency curves of /sup 16/O/sub 2/, /sup 16/O/sup 18/O, and /sup 18/O/sub 2/ have been obtained in the 660--1035 A region. Based on the detailed analysis of the observed isotope shifts, the autoionizing peaks in the 855--1010 A region were newly assigned. The strong peaks in the 900--1010 A region, which had been classified as belonging to four different (H, H', M, and M') progressions, were assigned to a single progression of the 3ssigma/sub g/ Rydberg state (H /sup 3/Pi/sub u/) converging to O/sup +//sub 2/(a /sup 4/Pi/sub u/). Similarly, the peaks in the 855--925 A region were assigned to a single progression of the 3ssigma/sub g/ Rydberg state (J /sup 3/Pi/sub u/) converging to O/sup +//sub 2/(A /sup 2/Pi/sub u/) . Molecular constants of these two states have been determined as follows, all in the unit of cm/sup -1/ except delta and r/sub e/: H /sup 3/Pi/sub u/; 3ssigma/sub g/, J /sup 3/Pi/sub u/; 3ssigma/sub g/, D/sub 0/ = 28 249 +- 26, D/sub 0/ = 21 832 +- 33, ..omega../sub e/ = 1058.5 +- 3.0, ..omega../sub e/ = 1 010.0 +- 5.5, ..omega../sub e/x/sub e/ = 10.56 +- 0.20, ..omega../sub e/x/sub e/ = 3.70 +- 0.39, T/sub 0/ = 99 639 +- 10, T/sub 0/ = 106 053 +- 17, delta = 1.096 +- 0.001, delta = 1.133 +- 0.002.

• Research Organization: Department of Chemistry, Tokyo Institute of Technology, Ohokayama, Meguro, Tokyo 152, Japan
• OSTI ID: 6408379
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 81:8; 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
ABSORPTION SPECTRA
AUTOIONIZATION
ELEMENTS
ENERGY LEVELS
EXCITED STATES
IONIZATION
ISOTOPE EFFECTS
MOLECULAR STRUCTURE
NONMETALS
OXYGEN
PHOTOIONIZATION
RYDBERG STATES
SPECTRA
SPECTRAL SHIFT
ULTRAVIOLET SPECTRA
VIBRATIONAL STATES