Efficient laser action on the 342-nm band of molecular iodine using ArF laser pumping

Shaw, M. J.; Edwards, Chris; O'Neill, F.; Fotakis, C.; Donovan, Robert J.

doi:10.1063/1.91942

Cited by 40 publications

(16 citation statements)

References 14 publications

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“…The motivation for several of these studies was derived from the observation by Shaw et al that upon excitation of I 2 at 193 nm, relaxation by Ar or SF 6 to the DЈ state was so efficient that laser action can be observed on the DЈ →AЈ transition at 342 nm. 28 In a related experiment, Stephenson, Hong, and Lester excited the NeICl van der Waals complex to the ␤ ion-pair state using a double resonance excitation scheme. 29 Dispersed emission spectra recorded following excitation of the complex revealed not only the expected vibrational predisso-ciation, but also efficient and selective changes in the electronic state of the ICl.…”

Section: Introductionmentioning

confidence: 99%

Collision-induced electronic energy transfer from v=0 of the E(0g+) ion-pair state in I2: Collisions with He and Ar

Fecko

Freedman

Stephenson

2002

The Journal of Chemical Physics

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The electronic energy transfer pathways that occur following collisions between I 2 in the E ion-pair electronic state ͑vϭ0, Jϭ55͒ and He and Ar atoms have been determined. The nearby D, DЈ, and ␤ ion-pair states are populated, but with relative branching ratios that vary with the rare gas collision partner. In He/I 2 collisions, the D state is preferentially populated, while Ar/I 2 collisions preferentially populate the ␤ electronic state. Bimolecular rate constants and effective hard sphere collision cross sections have been determined for each channel; the cross sections range from 7.0Ϯ1.0 Å 2 for populating the ␤ state with Ar collisions to 0.9Ϯ0.2 Å 2 for populating the DЈ state with He collisions. For both rare gas collision partners, and all three final electronic states, low vibrational levels are populated, in rough accord with the relevant Franck-Condon factors. There is little propensity observed for population of vibrational levels that are in near resonance with the initially prepared level in the E state.

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Section: Introductionmentioning

confidence: 99%

Collision-induced electronic energy transfer from v=0 of the E(0g+) ion-pair state in I2: Collisions with He and Ar

Fecko

Freedman

Stephenson

2002

The Journal of Chemical Physics

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“…Several studies have concentrated on relaxation upon single photon excitation of the D(0+) state, either by atomic line pumping [10], flashlamp pumping [5] or laser pumping [11][12][13]. Apart from D-E and D -+ D quenching also reactive transfer was observed [14].…”

Section: Introductionmentioning

confidence: 99%

Collision‐Induced E(0g+)−D(0u+) State‐to‐State Energy Transfer in I₂

1999

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Electronic energy transfer in the E(0g+) D(0+) system of I2 is investigated in an experiment, where single rovibrational quantum states are prepared, single collision conditions prevail, and the final states have been determined from dispersed fluorescence. In I (E) X (X Ar, N2, 02) the collisional decay is found to be governed by minimum energy transfer. With (X I2) an anomalous behaviour is found for the initially prepared E, v 8, J 56 level, which is tentatively ascribed to vibrational excitation of the collision partner. Keywords." Energy transfer; iodine; ion-pair state; fluorescence B3YI(0+) electronic state of iodine and bromine is often used as a prototype system [1]. Collisional relaxation data were put in a semi-empirical perspective by several authors [2, 3]. In most experimental studies

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“…tion of high vibrational levels of the D state at high buffer gas pressures. 6,7 Unfortunately, the kinetic analyses were based on the "one-level, one-way" approximation, in which all the rovibronic levels of each IP state within the tier were treated as a single level and the secondary collision processes were neglected (see, e.g., Refs. 8 and 9).…”

Section: Introductionmentioning

confidence: 99%

Non-adiabatic transitions from I2(${E} {\rm 0}_{g}^{+} $Eg+ and ${D}0_{u}^{+} $Du+) states induced by collisions with M = I2(${X}0_{g}^ + $Xg+) and H2O

Akopyan

Baturo

Lukashov

et al. 2012

The Journal of Chemical Physics

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The stepwise two-step two-color and three-step three-color laser excitation schemes are used for selective population of rovibronic levels of the first-tier ion-pair E0(g)(+) and D0(u)(+) states of molecular iodine and studies of non-adiabatic transitions to the D and E states induced by collisions with M = I(2)(X) and H(2)O. Collection and analysis of the luminescence after excitation of the v(E) = 8, 13 and v(D) = 13, 18 vibronic levels of the E and D states in the pure iodine vapor and the gas-phase mixtures with H(2)O provide rate constants for the non-adiabatic transitions to the D and E state induced by collisions with these molecules. Vibrational distributions for the [formula: see text] collision-induced non-adiabatic transitions (CINATs) are obtained. Rather strong λ(lum)(max) ≈ 3400 Å luminescence band is observed in the I(2) + H(2)O mixtures, whereas its intensity is ~100 times less in pure iodine vapor. Radiative lifetimes and quenching rate constants of the I(2)(E,v(E) = 8, 13 and D,v(D) = 13, 18) vibronic state are also determined. Rate constants of the [formula: see text], v(E) = 8-54, CINATs are measured again and compared with those obtained earlier. New data confirm resonance characters of the CINATs found in our laboratory about 10 years ago. Possible reasons of differences between rate constant values obtained in this and earlier works are discussed. It is shown, in particular, that differences in rate constants of non-resonant CINATs are due to admixture of water vapor in iodine.

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Efficient laser action on the 342-nm band of molecular iodine using ArF laser pumping

Cited by 40 publications

References 14 publications

Collision-induced electronic energy transfer from v=0 of the E(0g+) ion-pair state in I2: Collisions with He and Ar

Collision-induced electronic energy transfer from v=0 of the E(0g+) ion-pair state in I2: Collisions with He and Ar

Collision‐Induced E(0g+)−D(0u+) State‐to‐State Energy Transfer in I₂

Non-adiabatic transitions from I2(${E} {\rm 0}_{g}^{+} $Eg+ and ${D}0_{u}^{+} $Du+) states induced by collisions with M = I2(${X}0_{g}^ + $Xg+) and H2O

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Efficient laser action on the 342-nm band of molecular iodine using ArF laser pumping

Cited by 40 publications

References 14 publications

Collision-induced electronic energy transfer from v=0 of the E(0g+) ion-pair state in I2: Collisions with He and Ar

Collision-induced electronic energy transfer from v=0 of the E(0g+) ion-pair state in I2: Collisions with He and Ar

Collision‐Induced E(0g+)−D(0u+) State‐to‐State Energy Transfer in I2

Non-adiabatic transitions from I2(${E} {\rm 0}_{g}^{+} $Eg+ and ${D}0_{u}^{+} $Du+) states induced by collisions with M = I2(${X}0_{g}^ + $Xg+) and H2O

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Collision‐Induced E(0g+)−D(0u+) State‐to‐State Energy Transfer in I₂