Abstract
The D() ion‐pair state of I2 has been analyzed by the optical–optical double resonance (OODR) technique. In a stepwise three‐photon excitation scheme, D()–B3Π()–X1, the D() state appeared in the OODR spectrum as the vibrational progressions consisting of O, Q and S branches in accord with the rotational selection rule of ΔJ = 0 and ±2 for the coherent two‐photon transition from the B3Π() state. The D()–X1 fluorescence was resolved to determine the absolute vibrational numbering of the D() state. We derived Dunham parameters effective for ν = 0 through ν = 124 which were used to construct a Rydberg–Klein–Rees (RKR) potential curve.
Highlights
The study of molecules by multiphoton absorption has recently developed into a significant branch in molecular spectroscopy1
In this paper we present the results of the optical-optical double resonance (OODR) analysis on the
D(0+u) ion-pair state by the OODR transitions arising from a onephoton resonant three-photon absorption through the B3I-I(0+u) state as an intermediate
Summary
The D(0+u) ion-pair state of 12 has been analyzed by the optical-optical double resonance (OODR) technique. In a stepwise three-photon excitation scheme, D(O+u)-BaH(O+u)-X1E-, the D(0) state appeared in the OODR spectrum as the vibrational progressions consisting of O, Q and S branches in accord with the rotational selection rule of AJ 0 and _+2 for the coherent two-photon transition from the Bal-I(0+u) state. The D(0+u)-XIE fluorescence was resolved to determine the absolute vibrational numbering of the D(0+u) state. We derived Dunham parameters effective for v 0 through v 124 which were used to construct a Rydberg-Klein-Rees (RKR) potential curve
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