Photodissociation cage effect in van der Waals complexes: Fluorescence spectra of I/sub 2/ B(/sup 3/Pi/sub 0+u/) from the hindered photodissociation of I/sub 2/Ar at 488 nm

Journal Article · Thu Jul 01 04:00:00 EDT 1982 · J. Chem. Phys.; (United States)

OSTI ID:5168160

Valentini, J J; Cross, J B

The B..-->..X fluorescence from I/sub 2/ produced in the hindered photodissociation of I/sub 2/Ar at 488 nm has been resolved. The spectra show several vibrational progressions with low rotational energy, the most prominent of these is a (v',0) progression extending from v' = 49 to at least v' = 23. The I/sub 2/Ar complexes were excited and the I/sub 2/ fluorescence was observed under collision-free conditions in a supersonic free-jet expansion. We attribute these observation to one-atom photodissociation cage effect in the I/sub 2/Ar comples, in which the molecular iodine, although excited more than 400 cm/sup -1/ above B state dissociation limit, is prevented from dissociating by energy transfer to the argon atom, resulting in the breaking of the van der Waals bond: I/sub 2/Ar..-->..I/sub 2/(B)+Ar, leaving the iodine molecule in a bound level of the B electronic state, 386--1889 cm/sup -1/ below the dissociation limit. (AIP)

• Research Organization: University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
• OSTI ID: 5168160
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 77:1; 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 COMPOUNDS
ARGON IODIDES
CHEMICAL REACTIONS
DECOMPOSITION
DISSOCIATION
ELEMENTS
FLUORESCENCE
HALIDES
HALOGEN COMPOUNDS
HALOGENS
IODIDES
IODINE
IODINE COMPOUNDS
LUMINESCENCE
NONMETALS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RARE GAS COMPOUNDS