Communication: First observation of ground state I({sup 2}P{sub 3/2}) atoms from the CH{sub 3}I photodissociation in the B-band

Journal Article · Thu Jul 14 04:00:00 EDT 2011 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3613656· OSTI ID:22038641

Gonzalez, M G; Rodriguez, J D; Banares, L ^[1]

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1. Departamento de Quimica Fisica I, Facultad de Ciencias Quimicas, Universidad Complutense de Madrid, 28040 Madrid (Spain)

The photodissociation of CH{sub 3}I in the second absorption band (the B-band) has been studied at the wavelength 199.11 nm, coincident with the 3{sub 0}{sup 1} {sup 3}R{sub 1}(E)(leftarrow)X(tilde sign)({sup 1}A{sub 1}) CH{sub 3}I vibronic transition, using a combination of slice imaging and resonance enhanced multiphoton ionization detection of the CH{sub 3} fragment. The kinetic energy and angular distributions of the recoiling CH{sub 3} fragment confirm a major predissociation dynamics channel as a result of the interaction between the bound {sup 3}R{sub 1} Rydberg state and the repulsive {sup 3}A{sub 1}(E) state - ascribed to the A-band - yielding CH{sub 3} fragments in correlation with spin-orbit excited I*({sup 2}P{sub 1/2}) atoms. In addition, first evidence of a non-negligible population of ground state I({sup 2}P{sub 3/2}) atoms in the CH{sub 3} fragment slice images, suggests a secondary predissociation mechanism via interaction between the {sup 3}R{sub 1} Rydberg state and the repulsive A-band {sup 1}Q{sub 1} state.

• OSTI ID: 22038641
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 2 Vol. 135; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
ANGULAR DISTRIBUTION
GROUND STATES
INTERACTIONS
KINETIC ENERGY
METHYL IODIDE
MULTI-PHOTON PROCESSES
PHOTOLYSIS
PREDISSOCIATION
RYDBERG STATES