N. Legaysommaire et F. Legay, FTIR STUDY OF THE PHOTOCHEMISTRY OF HG AND H-2 IN A NITROGEN MATRIX -FORMATION AND DISSOCIATION OF HGH2 AND HHGHGH, Journal of physical chemistry, 99(46), 1995, pp. 16945-16952
The insertion of Hg into H-2 in a nitrogen matrix at low temperature h
as been induced using KrF laser irradiation, and the HgH2 produced is
identified by FTIR absorption spectroscopy. This reaction is in compet
ition with the E-V transfer from Hg(P-3(1)) to nitrogen, which has als
o been observed through the IR emission of vibrationally excited nitro
gen. The spectra of isolated and complexed HgH2 have been observed. In
the nitrogen matrix, annealing induces a much larger than usual frequ
ency shift, which is related to the appearance of a vacancy close to t
he HgH2 at its formation. The photochemistry of the HgH2 .. Hg complex
es at 249 nm gives a new molecule HHgHgH, which may be dissociated. Th
e isolated HgH2 is shown to be very stable under 249 nm irradiation an
d is found to dissociate under 193 nm irradiation. All the absorption
studies have also been done with deuterated compounds, and the force c
onstants of the HgH bonds of the new molecules have been determined.