Transition probabilities for the ionization of N₂, O₂, NO and CO molecules

Abstract

AbstractsFranck-Condon factors are presented for the normal and stable isotope-labelled N, , 0, , N O and CO molecules for transitions to the observed ionized states by using the Rydberg-Klein-Rees (RKR) potential energy curves of the various electronic states involved. It has been observed that for some transitions, the Franck-Condon factors based on the RKR potential energy curves differ appreciably from those based on the Morse potential function. The effect of isotopic substitution OR the transition probabilities is also quite significant in a number of cases.O n a calcult des facteurs de Franck-Condon pour les molCcules N, , 0, , NO et CO pour les transitions aux Ctats ionisCs observes. Les calculs ont Ct C basts sur les courbes de potentiel de Rydberg-Klein-Rees (RKR) des Ctats Clectroniques en question. On a observe que pour certaines transitions, les facteurs de Franck-Condon basts sur les courbes de potentiel RKR diff6rent d'une fason apprtciable de ceux obtenus de la fonction de potentiel de Morse. L'effet d'une substitution isotopique sur les probabilites de transition est aussi significatif dans plusieurs cas.Franck-Condon-Faktoren wurdenfur die Molekule N, , 0, ,KO und COfur Ubergange zu den beobachteten ionisierten Zustanden mit den Rydberg-Klein-Rees (RKR) Potentialkurven der entsprechenden elektronischen Zustande berechnet. Es wurde bemerkt dass fur gewisse Ubergange die Franck-Condon-Faktoren der RKR Potentialkurven merkbar von den der Morse-Potentialfunktion abweichen. Der effekt isotopischer Substitution auf den Ubergangswahrscheinlichkeiten ist auch in vielen Fallen ganz bedeutsam.

The dissociative ionization of nitrogen

“…2a shows the maximum of the second peak occurring at 390 meV kinetic energy carried away by the N + ion, i.e., at 780 meV total ion energy implied in the dissociation process. This kinetic energy corresponds to the υ' -6 level of the C 2 Σ u + state of N 2 + characterized by the highest Franck-Condon factor, as calculated by Jain and Sahni [28]. This tends to support the unambiguous interpretation of our results as the predissociation of the C 2 Σ u + state from the υ' = 3 to the υ' = 11 level.…”

“…The comparison of our results with the ion energy distributions deduced from time-of-flight experiments [16,28] is uneasy at low energy (<2 eV) [23]. At higher ion energies structures are observed in the same kinetic energy range in both the present curve and in that obtained by Smyth et al [16].…”

Mass-Analyzed Threshold Ionization (MATI) Spectroscopy of Atoms and Molecules Using VUV Synchrotron Radiation

“…The PES spectrum had been reproduced very well by the Franck-Condon calculation, 24,25 which is consistent with the small increase of the diatomic distance in the 1 Σ g + to 2 Σ g + transition (∼1.67 %). 26 The disagreement between PES and MATI spectra in terms of the vibrational intensity profile, therefore, suggests that the ionization efficiencies of N Therefore, multichannel quantum defect theory (MQDT) 29 should be employed for the further interpretation of detailed spectral intensity profiles, which is beyond the scope here at the present time.…”

The spectrum of molecular nitrogen

“…b The sign and final digit indicate the power of 10 to which each entry should be raised. N;(A2~) -N2<X1E;) N;( B2 l::) -N 2 (X 1 E;) N;<C 2 l:) -N 2 (X 1 l:+) Data from Jain and Sahni [338].…”