The influence of amplified spontaneous emission in collisional energy transfer studies exemplified by to transfer in I2

Ridley, Trevor; Lawley, Kenneth P.; Donovan, Robert J.

doi:10.1016/j.chemphys.2008.03.017

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…3͑c͒ was recorded in one of our earlier studies 23 where we were unaware of the problem. The intensity of the D0 u + ͑ 3 P 2 ͒ → X0 g + relative to the E0 g + ͑ 3 P 2 ͒ → A1 u is greater in the spectrum recorded after 3 h, consistent with significant concentrations of impurity being present in this period.…”

Section: Excitation Of E"v =8…mentioning

confidence: 99%

Long-range collisional energy transfer between charge-transfer (ion-pair) states of I2, induced by H2O and I2(X)

Ridley

Lawley

Donovan

2009

The Journal of Chemical Physics

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Long-range (resonant) energy transfer, between g/u charge-transfer states of molecular iodine [i.e., f0(g) (+)((3)P(0))-->F0(u)(+)((3)P(0)) and E0(g)(+)((3)P(2))-->D0(u) (+)((3)P(2))], induced by collisions with H(2)O and I(2)(X) via multipole coupling, has been observed. Large rate constants, up to 5 x 10(-9) molecules(-1) cm(3) s(-1), for collisional transfer between a range of vibrational levels of the f0(g)(+)((3)P(0)) and F0(u)(+)((3)P(0)) ion-pair states of I(2), by H(2)O, are reported. Some previously reported studies on E0(g)(+)((3)P(2))-->D0(u)(+)((3)P(2)) and f0(g)(+)((3)P(0))-->F0(u)(+)((3)P(0)) collisional transfer, induced by I(2)(X), have been repeated and revised rate data are presented; the range of initially excited vibrational states studied has also been extended. Much smaller rate constants for quenching by I(2)(X), compared to H(2)O, are found and it is proposed that H(2)O desorbed from the walls of the sample cell could have significantly affected much larger rate data previously reported in the literature. For both collision partners, a model is proposed in which long-range, near-resonant interactions can occur when there is close matching of the change in energy in the ion-pair states with the change in energy that accompanies the rotational transition undergone by the collision partner.

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Section: Excitation Of E"v =8…mentioning

confidence: 99%

Long-range collisional energy transfer between charge-transfer (ion-pair) states of I2, induced by H2O and I2(X)

Ridley

Lawley

Donovan

2009

The Journal of Chemical Physics

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“…Nakano and co-workers, by analyzing the vibrational distribution in the D 0 u + ( 3 P 2 ) state after excitation of the E 0 g + ( 3 P 2 ) state, concluded that two different deactivation processes contributed to the population in the D 0 u + ( 3 P 2 ) state: one is ASE from the E 0 g + ( 3 P 2 ) state down to the D 0 u + ( 3 P 2 ) state, and the other is collision-induced energy transfer. Ridley et al concluded that the ASE process must be taken into account whenever a large dipole-allowed transition connects the electronic states between which lies the energy transfer of interest. We previously succeeded in recording ASE from the lower vibrational levels of the E 0 g + ( 3 P 2 ) state in the far-infrared region and determined the ratio of the two competing processes to be ∼95% for ASE and ∼5% for the collisional process.…”

Section: Introductionmentioning

confidence: 99%

Blackbody-Radiation-Induced Population Transfer Dynamics from Highly Vibrationally Excited Levels of the E 0_g⁺ (³P₂) Ion-Pair State of I₂

Hoshino

Tsukiyama

2019

J. Phys. Chem. A

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We report the decay dynamics from the highly excited vibrational levels of the E 0 g + (3 P 2) ion-pair state of I2. Strong UV fluorescence belonging to the D 0 u + (3 P 2) → X 1Σ g + transition was observed upon the excitation of the E 0 g + (3 P 2) (v E = 77 and 78) state. The vibrational levels populated in the D 0 u + (3 P 2) state were found to be located at slightly higher energies than the vibrational levels of the laser-excited E 0 g + (3 P 2) state. The vibrational levels populated in the D 0 u + (3 P 2) state were restricted to those which have relatively large Franck–Condon factors between the laser-prepared vibronic levels. The absorption and stimulated emission rate in the presence of thermal radiation strongly suggests that the population in the D 0 u + (3 P 2) state was induced by the absorption of blackbody radiation. The energy partitioning process in the high vibrational levels in the E 0 g + (3 P 2) state was found to be totally different from that in the lower levels (v E = 0–2) where amplified spontaneous emission was a major relaxation pathway.

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“…Recently, it was shown that amplified spontaneous emission (ASE; Refs. [16][17][18][19] as well as water impurity 20 − −−− → D) CINAT rate constants. Very recently, the first experimental results for the ungerade D-state CINATs in collisions of molecular iodine with the rare gases Rg = He, Ar, Xe, as well as some preliminary data for the collisions with the I 2 (X) molecule 21 were reported.…”

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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The influence of amplified spontaneous emission in collisional energy transfer studies exemplified by to transfer in I2

Cited by 9 publications

References 18 publications

Long-range collisional energy transfer between charge-transfer (ion-pair) states of I2, induced by H2O and I2(X)

Long-range collisional energy transfer between charge-transfer (ion-pair) states of I2, induced by H2O and I2(X)

Blackbody-Radiation-Induced Population Transfer Dynamics from Highly Vibrationally Excited Levels of the E 0_g⁺ (³P₂) Ion-Pair State of 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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The influence of amplified spontaneous emission in collisional energy transfer studies exemplified by to transfer in I2

Cited by 9 publications

References 18 publications

Long-range collisional energy transfer between charge-transfer (ion-pair) states of I2, induced by H2O and I2(X)

Long-range collisional energy transfer between charge-transfer (ion-pair) states of I2, induced by H2O and I2(X)

Blackbody-Radiation-Induced Population Transfer Dynamics from Highly Vibrationally Excited Levels of the E 0g+ (3P2) Ion-Pair State of 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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Blackbody-Radiation-Induced Population Transfer Dynamics from Highly Vibrationally Excited Levels of the E 0_g⁺ (³P₂) Ion-Pair State of I₂