Effect of initial energy of hydrogen atoms on reactions and trapping in solid hydrogen at 4 K

Journal Article · Thu Apr 28 04:00:00 EDT 1983 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100232a030· OSTI ID:5334302

Miyazaki, T; Tsuruta, H; Fueki, K

Reactions and trapping of H atoms produced by photolysis of HI (or HBr) have been studied in solid D/sub 2/ at 4 K by ESR spectroscopy. So that hot H atoms with different kinetic energies could be obtained, the photolysis was performed with monochromatic light at 254, 229, and 185 nm. The hot H atom abstracts a D atom from D/sub 2/ to form a trapped D/sub t/ atom or is trapped in the matrix by losing its energy. The ratio of the yield of D/sub t/ to the total yield of trapped hydrogen atoms (D/sub t/ + H/sub t/), that is, the fraction of the hot H atoms that have reacted while they are hot, shows a maximum at an initial H-atom energy of about 2 eV and decreases at higher energies. This energy dependence of the ratio is quite different from the results reported for the gas phase and cannot be explained by a collisional deactivation mechanism competing with an abstraction reaction. The result indicates that something is unique about the solid-state reaction. The ESR saturation behavior of trapped D/sub t/ and H/sub t/ atoms produced by photolysis of hydrogen halides is quite different from that of D/sub t/ produced by ..gamma..-radiolysis of D/sub 2/.

• Research Organization: Nagoya Univ., Japan
• OSTI ID: 5334302
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 87:9; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400500* -- Photochemistry
400701 -- Radiochemistry & Nuclear Chemistry-- Hot-Atom Chemistry
CHEMICAL REACTIONS
DECOMPOSITION
DEUTERIUM
ELECTRON SPIN RESONANCE
ELEMENTS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INORGANIC ACIDS
IODIC ACID
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RESONANCE
STABLE ISOTOPES
TRAPPING
ULTRALOW TEMPERATURE