Molecular beam photoionization study of CO, N2, and NO dimers and clusters

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Abstract
Photoionization efficiency (PIE) data for (CO)+2, (N2)+2, and (NO)+2 have been obtained near the thresholds using the molecular beam method. The ionization energies (IE) for (CO)2, (N2)2, and (NO)2 were measured to be 13.05±0.04 eV (950±3 Å), 14.69±0.05 eV (844±3 Å), and 8.736±0.002 eV (1419.2±0.3 Å), respectively. Using these values, the known IE’s for CO, N2, and NO, and the estimated binding energies for (CO)2, (N2)2, and (NO)2, the bond dissocations energies for CO+⋅CO, N+2⋅N2, and NO+⋅NO were deduced to be 0.97±0.04, 0.90±0.05, and 0.598±0.006 eV, respectively. From the analysis of the PIE curve for (NO)+2, the IE’s of (NO)2 to NO+(?1S+, v = 1)⋅NO and NO+(?1S+,v = 2)⋅NO were determined to be 8.997±0.007 eV (1 378±1 A°) and 9.253±0.013 eV (1 340±2 A°), respectively. This measurement supports the conclusion that the bonding of NO+ in NO+⋅NO is stronger than that of NO, but weaker than that of NO+. The IE’s for (CO)3, (N2)3, and (NO)n = 3–6 were also measured.