The vibrational spectra of molecular ions isolated in solid neon. V. N2O+and NNOminus;2

摘要

When a Ne:N2O=200 or 800 sample is codeposited at approximately 5 K with a beam of neon atoms that has been excited in a microwave discharge, the infrared spectrum of the products includes absorptions contributed by the two stretching fundamentals of groundhyphen;state N2O+. An absorption near 1200 cmminus;1also results from the stabilization of NNOminus;2on reaction of Ominus;with N2O. The two other stretching fundamentals of NNOminus;2have also been identified. Detailed isotopic substitution studies support these identifications and permit a normal coordinate analysis for both N2O+and NNOminus;2. The nitrogenndash;nitrogen bond of NNOminus;2has approximately single bond character, and the nitrogenndash;oxygen bonds are relatively weak. The photodestruction threshold for NNOminus;2in this experimental system is near 420 nm. Photolysis of NNOminus;2is accompanied by growth in the absorptions ofcisONNO. Several other infrared absorptions in the initial sample are tentatively assigned to vibrations of N2O complexed to various ions.