Intermediate state polarization in multiphoton ionization of HCl

Journal Article · Fri Jul 21 04:00:00 EDT 2006 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.2218336· OSTI ID:20864275

Chichinin, A I; Shternin, P S; Goedecke, N; Kauczok, S; Maul, C; Vasyutinskii, O S; Gericke, K -H ^[1]

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1. Institut fuer Physikalische und Theoretische Chemie, Technische Universitaet Braunschweig, 38106 Braunschweig (Germany) and Institute of Chemical Kinetics and Combustion, 630090 Novosibirsk (Russian Federation)

The paper presents the detailed theoretical description of the intermediate state polarization and photofragment angular distribution in resonance enhanced multiphoton ionization (REMPI) of molecules and the experimental investigation of these effects in the E {sup 1}{sigma}{sup +} and V {sup 1}{sigma}{sup +} states of HCl populated by two-photon transitions. It is shown that the intermediate state polarization can be characterized by the universal parameter b which is in general a complex number containing information about the symmetry of the two-photon excitation and possible phase shifts. The photofragment angular distribution produced by one- or multiphoton excitation of the polarized intermediate state is presented as a product of the intermediate state axis spatial distribution and the angular distribution of the photofragments from an unpolarized intermediate state. Experiments have been carried out by two complementary methods: REMPI absorption spectroscopy of rotationally resolved (E,v{sup '}=0<-X,v{sup ''}=0) and (V,v{sup '}=12<-X,v{sup ''}=0) transitions and REMPI via the Q(0) and Q(1) rotational transitions followed by three-dimensional ion imaging detection. The values of the parameter b determined from experiment manifest the mostly perpendicular nature of the initial two-photon transition. The experimentally obtained H{sup +} -ion fragment angular distributions produced via the Q(1) rotational transition show good agreement with theoretical prediction.

• OSTI ID: 20864275
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 3 Vol. 125; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTROSCOPY
ANGULAR DISTRIBUTION
DISSOCIATION
EXCITATION
HYDROCHLORIC ACID
HYDROGEN IONS 1 PLUS
INTERMEDIATE STATE
MULTI-PHOTON PROCESSES
PHASE SHIFT
PHOTOIONIZATION
PHOTOLYSIS
PHOTON-MOLECULE COLLISIONS
POLARIZATION
ROTATIONAL STATES
SPATIAL DISTRIBUTION