Controlling the pathways in molecular decomposition: The vibrationally mediated photodissociation of water

Journal Article · Thu Jul 13 04:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100351a003· OSTI ID:6972077

Vander Wal, R L; Crim, F F ^[1]

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1. Univ. of Wisconsin, Madison (USA)

Vibrationally mediated photodissociation, in which vibrational overtone excitation prepares a single rovibrational state of water that an ultraviolet photon subsequently dissociates, permits a fully state resolved study of the photodissociation of water. Dissociating water from six different initial rotational states and detecting the OH products by laser-induced fluorescence shows that the distribution of the products among their rotational states depends strongly on the state initially selected in the vibrational overtone excitation step. These measurements also demonstrate the control of the dissociation pathway by selection of different intermediate states. Dissociating water molecules from one vibrational state ({vert bar}04>4{sup {minus}}) produces almost no vibrationally excited OH products, but dissociating another state ({vert bar}13>{sup {minus}}) that corresponds to a different nuclear motion produces roughly comparable amounts of OH(v = 1) and OH(v = O).

• OSTI ID: 6972077
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:14; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400000* -- Chemistry
400500 -- Photochemistry
CHEMISTRY
DATA
DATA ANALYSIS
DISSOCIATION
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
OXYGEN COMPOUNDS
PHOTOCHEMISTRY
RADIATIONS
ULTRAVIOLET RADIATION
WATER