Dissociation of I2in O2(1Δ)-I atom transfer lasers

Heidner, R. F.; Gardner, C. E.; El-Sayed, T M; Sagal, G.I.

doi:10.1016/0009-2614(81)85345-6

Cited by 29 publications

(6 citation statements)

References 10 publications

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“…band to the total excitation calculated in eq 20. The dominant o'levels were 13,11,12, and 9 with respectively 46, 29, 14, and 3% of the total B state population. The observed LIF signal from 3.2 X 109 molecules/cm3 with this ' distribution was 0.87 full scale.…”

Section: Discussionmentioning

confidence: 98%

“…Several kinetic models at various levels of complexity are used in the interpretation of the results to be presented in section IV. The simplest model considers only the reactions I* + I2 -I(d=40) + I (lc) (ID A more complete kinetic scheme considers each vibrational level of I2 separately, allowing some fraction of the total I* + I2 quenching encounters to populate each vibrational level, and then considers the cascade of vibrational relaxation (dominated by v to u -1 processes of the V-T type): I* + I2 -^I + I2(20<o<45) (lb) 12(20< <45) +M-^* I2(19<i;-1<44) (12) where the known total quenching rate of I* by I2 is given by 45 = klc + k10 (13) u=0 A simple computer program was used to model this kinetic system. It was assumed for simplicity that kr was independent of v. The relative values of fev, i.e., the distribution of I2 vibrational states directly populated by energy transfer, and kT were treated as unknowns and independently varied over a reasonable range of expectations.…”

Section: Kinetic Modelsmentioning

confidence: 99%

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Electronic-to-Vibrational Energy Transfer from I(5²P_1/2)to I₂(25<v<43)

Hall¹,

Marinelli²,

Houston³

1983

J. Phys. Chem.

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Electronic-to-vibrational energy transfer from 1*(5 2P1/2) to 12(25 30. Roughly 2% of the I* deactivations result in I2(u=40). The rate constants for vibrational relaxation of 12(u=40) by argon, helium, and I2 at room temperature are (7.3 f 0.3) X lo5 s-l torr-l, (1.02 f 0.2) X loe s-' torr-', and (1.8 f 0.4) X lo6 s-l torr-', respect,ively. These results have important implications for the mechanism of I2 dissociation in the chemical oxygen/iodine laser. A chainbranching mechanism consisting of the steps I* + I2 + I + 1,(20

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Section: Discussionmentioning

confidence: 98%

Section: Kinetic Modelsmentioning

confidence: 99%

Electronic-to-Vibrational Energy Transfer from I(5²P_1/2)to I₂(25<v<43)

Hall¹,

Marinelli²,

Houston³

1983

J. Phys. Chem.

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“…Hence, the population of this state from thermally populated ground state levels by collisions with is endothermic by -2 000 cm-1. Thus, the hypothesis that the A' state serves as an intermediate reservoir, as suggested by Heidner et al [16], cannot be retained as the main process for the first step in I2 dissociation. However, highly excited levels of the X(1 Eg+) state lying 7 882 cm -1 above thermally populated levels (v = 43-45) may play the part of a reservoir « state » in the first step.…”

Section: Excitation Collisional Processes -We Canmentioning

confidence: 96%

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

1982

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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

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“…The total rate for Reaction (13) has been measured to be 2 to 3 x 10-11 cm 3 / molecule-sec. 3 9 ,40 There is good qualitative evidence that the branching ratio to form I* (kl3a/kl3) is small, 3 7 although the production of I* from secondary processes (i.e., k 1 5 ) is significant.…”

Section: -15mentioning

confidence: 99%

Photochemistry and kinetics of the O*2–HI system

Koffend

Gardner

Heidner

1984

The Journal of Chemical Physics

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Rate coefficients of <2×10−17 and (2.7±1.0)×10−14 cm3/molecule s have been measured by flow tube techniques for HI quenching of O2(1Δ) and O2(1Σ), respectively. In a separate experiment, the quantum yields of I(2P1/2) from HI and CF3I photolysis at 249 nm were determined to be (0.65±0.04) and (0.88±0.06), respectively, relative to a quantum yield of 1.0 from the photolysis of n-C3F7I. The quenching rate of I* by HI was determined to be (5.7±1.0)×10−14 cm3/molecule s. Experimental data and modeling results are presented for photolysis of a mixture of O*2 and HI. These data are relevant to consideration of a pulsed version of the chemical oxygen–iodine laser (COIL).

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Dissociation of I2in O2(1Δ)-I atom transfer lasers

Cited by 29 publications

References 10 publications

Electronic-to-Vibrational Energy Transfer from I(5²P_1/2)to I₂(25<v<43)

Electronic-to-Vibrational Energy Transfer from I(5²P_1/2)to I₂(25<v<43)

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

Photochemistry and kinetics of the O*2–HI system

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Dissociation of I2in O2(1Δ)-I atom transfer lasers

Cited by 29 publications

References 10 publications

Electronic-to-Vibrational Energy Transfer from I(52P1/2)to I2(25<v<43)

Electronic-to-Vibrational Energy Transfer from I(52P1/2)to I2(25<v<43)

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

Photochemistry and kinetics of the O*2–HI system

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Resources

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Electronic-to-Vibrational Energy Transfer from I(5²P_1/2)to I₂(25<v<43)

Electronic-to-Vibrational Energy Transfer from I(5²P_1/2)to I₂(25<v<43)