Collisionally induced optical double resonance in I2 : rotational analysis of the D'(2g) - A'(2u) laser transition

Abstract

The I2 D'(2g)-A'(2u) transition has been excited by collisionally induced optical double resonance. This system has been rotationally analysed for more than 50 vibrational levels of the A'(2u) state. The long range behaviour of the A' state has been studied. The dissociation energy of this state has been determined to be Dc = 2 505.7 ± 1.9 cm-1. The D' state has been identifed with the α state of King et al. (Chem. Phys. 56 (1981) 145). The energies of the D' and A' states have been determined relative to X 1∑g+(ν = 0, J = 0) to be T0 = 40 331.6 ± 1.6 cm-1 and To = 9 988.7 ± 1.6 cm-1, respectively. The mechanism of this double resonance is discussed. Efficient collisional transfer to the D' state is observed and helps to shed some light on the operation of the optically pumped I2 D'-A' laser

Femtosecond dynamics of photoinduced molecular detachment from halogenated alkanes. I. Transition state dynamics and product channel coherence

“…One of the most striking observations is that in all cases the principal fluorescent product is a halogen molecule in the DЈ state, which is an ion-pair state, i.e., it correlates to X ϩ ϩX Ϫ . [29][30][31][32][33][34] In the case of CH 2 I 2 , this is consistent with frequency-resolved studies of photodissociation FIG. 1.…”

Absolute Position of the D′2g(3P2) Ion-Pair State of I2 Determined by Perturbation-Facilitated Optical–Optical Double Resonance

“…Koffend et al studied the D 2 g ( 3 P 2 )-A 3 (2 u ) transition by the collisionally induced double resonance technique (8). The A 3 (2 u ) state was rotationally analyzed for the more than 50 vibrational states close to the dissociation limit.…”

Analysis of the g−(3P1)–B ′3 Π(0u−) system of I2 by perturbation-facilitated optical–optical double resonance

“…This system has been analyzed in emission, [1][2][3][4] and more recently characterized with scrutinizing precision by several laser excitation experiments. [5][6][7][8][9][10] The second most intense system lies at 288 nm, whose current information has only come from emission spectroscopy. This transition was tentatively assigned as 0 g Ϫ ( 3 P 1 ) -B Ј 3 ⌸(0 u Ϫ ) by Viswanathan and Tellinghuisen through the vibrational analysis of photographically recorded spectra for two isotope species, 127 I 2 and 129 I 2 .…”