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

Observation and analysis of the 2g(1D) ion-pair state of I2: The g/u mixing between the 1u(1D) and 2g(1D) states

“…17 We confirmed the occurrence of the same progression shown in Fig. 17 We confirmed the occurrence of the same progression shown in Fig.…”

“…The upper state in the 230 nm band was then expected to be the 2 g ( 1 D) ion-pair state in view of the ⌬⍀ϭ0 propensity rule. According to our experience in the study of the 2 g ( 3 P 2 ) state, 17 the vibrational progression might extend with increasing the intensities at the energies higher than the 2 g ( 1 D) vϭ2 state in the double resonance spectra recorded through the B 3 ⌸(0 u ϩ ) -bЈ 2 u mixing state available. From the sum of the pump and probe frequencies recorded the spectrum in Fig.…”

“…Therefore, the studies were principally limited to the ⍀ϭ0 ϩ states using the B 3 ⌸(0 u ϩ ) intermediate state and our systematic approach to identify all of the ion-pair states has failed. [15][16][17] The purpose of this paper is to report the analysis of the 2 g ( 1 D) ion-pair state. 12,13 Recently, we have started a new program of studies on the ion-pair states by perturbation-facilitated optical-optical double resonance.…”

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

“…All of these states were identified with reasonable accuracy and known to lie at ϳ40 000 cm Ϫ1 above the ground states. 10,[15][16][17][18] None of them should be a candidate for the upper state of the second progression with about 100 cm Ϫ1 intervals from their known spectroscopic constants. In the 47 500 cm Ϫ1 energy region, their vibrational states occur with ϳ75 cm Ϫ1 vibrational intervals as shown for the 0 g ϩ ( 3 P 2 ) state in Fig.…”

“…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 .…”