On the behaviour of nitrogen oxides in liquefied argon and krypton. Dimerisation of nitric oxide

Article abstract of DOI:10.1016/0022-2860(94)07975-7

Solutions containing several nitrogen oxide species have been investigated in liquefied argon in the temperature range 84-105 K, and in liquefied krypton in the temperature range 116-150 K, using infrared spectroscopy.The following nitrogen oxide species were characterised in these solutions: NO, cis-ONNO, trans-ONNO, the asymmetric dimer ONON, asymmetric ONNO2, symmetric ONONO and N2O4 with D_2h symmetry.The enthalpy of dimerisation of NO to cis-ONNO has been determined in liquefied argon to be -14.3 +/- 1 kJ mol^-1.