The vibrational spectra of molecular ions isolated in solid neon. IV. NO+, NOminus;, ONNO+, and ONNOminus;

摘要

When a Ne:NO sample is codeposited at approximately 5 K with a beam of neon atoms that has been excited in a microwave discharge, photoionization and Penning ionization of the NO lead to the stabilization of both monomer and dimer ions. The most prominent infrared absorption, at 1619.2 cmminus;1, results from the reaction of NOminus;with NO or of an electron with (NO)2to form the chargehyphen;delocalizedtranshyphen;ONNOminus;species. The position of the totally symmetric NOhyphen;stretching absorption oftransONNOminus;can be inferred from observation of a combination band. The infrared absorption of NO+has been detected very close to the gashyphen;phase band center. Other infrared absorptions have been tentatively assigned to NOminus;,cisONNOminus;,transONNO, and the lowest energy isomer of ONNO+. Comparison of the gashyphen;phase vibrational frequencies observed for the weakly bound speciescisONNO and N2O3with the corresponding frequencies observed in this neonhyphen;matrix study suggests that the matrix shifts for the dimer ion absorptions in the midhyphen;infrared probably amount to less than 1percnt;.