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

Journal Article · Thu Jul 13 00:00:00 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), Vol. 93:14; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

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