Two-photon spectroscopy of the NO–Ne complex

Abstract

Electronic states of the NO–Ne complex correlating with several low lying Rydberg states of the NO molecule are investigated using (2+1) resonance enhanced multiphoton ionization. The observed band systems for the states F 2Δ, E 2Σ, and C 2Π consist of at least two vibrational bands assigned to the stretching mode. For the H 2Π state five members of the stretch progression are observed. Binding energies range from 120 to 280 cm−1. The rotational structure of the observed bands is analyzed using a rigid rotor Hamiltonian. Jacobi bond angles between 50° and 85° are found for the vibrationally averaged structures. Spectra for the NO–X complexes (X=Ar, Ne) correlating with the vibrational levels C 2Π v′(NO)=0, 1, and 4 exhibit a constant red shift. The anomalous red shift found for the levels v′(NO)=2, 3 indicates a change in the degree of mixing with the state B 2Π upon complexation.

Interaction of the NO 3pπ (C 2Π) Rydberg state with RG (RG = Ne, Kr, and Xe): Potential energy surfaces and spectroscopy

“…Interestingly, while the spectra for NO-Ne and NO-Kr were recorded in the [NO-RG] + mass channel, the spectra for NO-Xe were recorded in the Xe + mass channel (recall that the initial electronic excitation is on NO); the latter aspect was discussed by Miller in that work, as well as others 19 -this will be further commented on below. Vastly improvedC state REMPI spectra have been published for NO-Ne (v NO = 1, 2, and 4) by Fleniken et al, 20 and for NO-Kr (v NO = 0) by Mack et al, 21 with the latter paper also reporting the corresponding NO-Xe spectrum again, which was shown to be similar to that of Miller. 21 Meyer and coworkers have suggested an interpretation of theC state spectra 20,21 in terms of progressions of intermolecular stretches and bends, but with associated structure attributable to rotation of the complex about the a inertial axis (almost coincident with the Jacobi R direction) being a key aspect of the spectrum.…”

“…Vastly improvedC state REMPI spectra have been published for NO-Ne (v NO = 1, 2, and 4) by Fleniken et al, 20 and for NO-Kr (v NO = 0) by Mack et al, 21 with the latter paper also reporting the corresponding NO-Xe spectrum again, which was shown to be similar to that of Miller. 21 Meyer and coworkers have suggested an interpretation of theC state spectra 20,21 in terms of progressions of intermolecular stretches and bends, but with associated structure attributable to rotation of the complex about the a inertial axis (almost coincident with the Jacobi R direction) being a key aspect of the spectrum. This interpretation built on the model put forward by Meyer to explain the NO-Ar spectrum 22 -see also Ref.…”

The binding energies of NO–Rg (Rg = He, Ne, Ar) determined by velocity map imaging

“…7,[17][18][19][20][21] zero point vibrational level inX to bound levels inÃ. 21 These results explain the difficulty of obtaining spectra attributable to theÃ-X transition of the complex.…”

“…While several excited electronic states of NO-Ne have been extensively studied through multiphoton excitation, [16][17][18] theÃ←X band origin has not been observed despite several attempts. 7,[17][18][19][20][21] zero point vibrational level inX to bound levels inÃ.…”

The NO(X2Π)–Ne complex. II. Investigation of the lower bound states based on new potential energy surfaces

“…In earlier work, Miller and Cheng 15 and Meyer and co-workers 16 used (2ϩ1) REMPI to investigation the complex of NO with Ne by making use of several different NO Rydberg states. In the preceding article, 17 Kim, Meyer, and Fleniken ͑KMF͒ have used this technique to carry out the IR ͑infrared͒ REMPI double resonance spectroscopy of the NO-Ne complex and hence extract information on the lowest bend-stretch levels of this complex, in a manner similar to that described earlier for NO-Ar.…”