Photochemical Fe + H/sub 2/ reaction in Ar and Kr matrices by irradiation in the visible region
The rate of the (first-order) photochemical reaction between Fe atoms and H/sub 2/ molecules at dilute concentrations in Ar and Kr matrices has been measured at a number of irradiation frequencies between 16,000 and 18,600 cm/sup -1/, which covers excited states of the Fe atom with both 3d/sup 6/4s/sup 2/ and 3d/sup 7/4s/sup 1/ configurations. The results show that excitation of the atom, either directly or indirectly, into the a/sup 5/P/sub 3/ (d/sup 7/s/sup 1/) state leads to reaction but that the higher energy a/sup 3/P/sub 2/ (d/sup 6/s/sup 2/) state is unreactive. In Ar matrices, the rate of formation of FeH/sub 2/ can be related to the lifetime of the /sup 5/P/sub 3/ state. Use of H/sub 2/, D/sub 2/, and HD shows the different isotopic effect on the formation rate in the two matrices as well as the lesser isotope effect on the photodecomposition of FeH/sub 2/. Vibrational intensities in the infrared spectra suggest a lower limit of about 170/sup 0/ for the valence angle in the HFeH molecule. 12 references, 9 figures, 3 tables.
- Research Organization:
- Univ. of Pennsylvania, Philadelphia
- OSTI ID:
- 5895122
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 90:9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
DEUTERIUM
ISOTOPE EFFECTS
DEUTERIUM COMPOUNDS
HYDROGEN
PHOTOCHEMICAL REACTIONS
IRON
EXCITED STATES
ARGON
EXPERIMENTAL DATA
KRYPTON
LIFETIME
VISIBLE RADIATION
CHEMICAL REACTIONS
DATA
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
FLUIDS
GASES
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INFORMATION
ISOTOPES
LIGHT NUCLEI
METALS
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
RADIATIONS
RARE GASES
STABLE ISOTOPES
TRANSITION ELEMENTS
400500* - Photochemistry
400202 - Isotope Effects
Isotope Exchange
& Isotope Separation