Collisional quenching of excited iodine atoms I(5<i>p</i>5 2<i>P</i>1/2) by selected molecules

Burde, D. H.; McFarlane, R. A.

doi:10.1063/1.432323

Cited by 58 publications

(11 citation statements)

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“…If we assume that the limiting electron concentrations for which the homogeneity of the gas discharge is not yet disturbed are ~1015 cm -3, the limiting initial concentration of metal-vapor atoms n00 may be as high as 1016 cm -3 with allowance for K = 9; this concentration is an order of magnitude larger than the corresponding concentration of metal-vapor atoms for collisional lasers of the first type. In addition, in collisional lasers of the second type, there is no need for high concentrations of particles quenching the metastable levels because the rate of mixing (thermalization) of the levels within the GLLL in collisions of metal-vapor atoms with atoms and molecules of the quenching gas is relatively high [41]. Thus, for example, in the reactions Tl*(2P3/2) + T1 ~ TI(2pU2) + T1 + 7793 cm -1, I*(2p1/2) + I2 q> I(2P3/2) + I2 + 7603 cm -1, = 4.10 -16 cm 2 [42], q = 3.1 9 10 -n cm3/s [41].…”

Section: Qh /Qh (Qm(1)o/qorn(1) )mentioning

confidence: 99%

“…In addition, in collisional lasers of the second type, there is no need for high concentrations of particles quenching the metastable levels because the rate of mixing (thermalization) of the levels within the GLLL in collisions of metal-vapor atoms with atoms and molecules of the quenching gas is relatively high [41]. Thus, for example, in the reactions Tl*(2P3/2) + T1 ~ TI(2pU2) + T1 + 7793 cm -1, I*(2p1/2) + I2 q> I(2P3/2) + I2 + 7603 cm -1, = 4.10 -16 cm 2 [42], q = 3.1 9 10 -n cm3/s [41].…”

Section: Qh /Qh (Qm(1)o/qorn(1) )mentioning

confidence: 99%

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Theoretical feasibility study of new high-efficiency continuous-wave lasers operating at electron transitions in the spectral regions from near ir to uv on the basis of unconventional mechanisms of forming the active gaseous media

et al. 2000

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This paper is a review of the results of theoretical studies related to the search for new mechanisms, which are not yet completely understood and have not been implemented so far, of forming the active laser media that offer the prospect of development of high-efficiency continuous-wave (cw) laser operating at electron transitions (in atoms or molecules) in a wide range of wavelengths (from near IR to UV). The main attention is paid to unconventional mechanisms of forming the population inversion of lasing-active levels. These mechanisms involve the intramultiplet (due to collisions with heavy particles) or ionization-induced (due to collisions with electrons) deactivation of the lowest lasing-active atomic level; the population of the upper lasing-active level as a result of three-body electron ion recombination induced by the presence of alkali impurity, with simultaneous intramultiplet decay of the lower level; the mechanism ensuring the lasing transitions between repulsing terms of the involved molecules; and the exchange of vibrational-electronic excitation (for example, exchange of two vibrational quanta of an excited hydrogen molecule for a single electronic quantum of the iodine atom).

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Section: Qh /Qh (Qm(1)o/qorn(1) )mentioning

confidence: 99%

Section: Qh /Qh (Qm(1)o/qorn(1) )mentioning

confidence: 99%

Theoretical feasibility study of new high-efficiency continuous-wave lasers operating at electron transitions in the spectral regions from near ir to uv on the basis of unconventional mechanisms of forming the active gaseous media

et al. 2000

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“…A comparison of the quenching constant with those available in the literature is shown in Table I, where a good agreement is observed, especially with the four latest values reported. Burde and McFarlane [22] used the same experimental technique although a different precursor, while a time resolved infrared fluorescence determination was carried out by Grimley and Houston [8], and by Gonzalez Liz et al [17].…”

Section: Kinetic Analysismentioning

confidence: 99%

Quenching of I(2P�) by R-OH compounds. Influence of the alkyl group on the quenching efficiency

Chiappero

Badini

Argüello

1997

Int. J. Chem. Kinet.

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I* emission. These have been extended to many systems to understand the mechanism involved in energy transfer processes. This problem has been tackled using several approaches: (a) Direct measurement of state-to-state E-v rate constants; (b) Temperature dependence of the bulk or overall quenching rate constants; (c) Isotope effects on the observed quenching rate constants; and (d) study of the quenching efficiencies of a "family" of compounds.Although the first approach is the most satisfactory and direct, only in few cases is it experimentally achievable. Few systems (HF, H 2 , and H 2 O) [5][6][7][8] have been studied directly (case a) because of the complexity added by the acceptor intramolecular energy redistribution which grows with the number of vibrational degrees of freedom. Based on the kinetic analysis of the system, state-to-state energy transfer studies are limited up to triatomic acceptor molecules. INTRODUCTIONThe study of the electronically excited iodine atom, I ( 2 P 1/2 ) (hereafter called I*) constitutes a case example of a system which can undergo electronic to vibrational-rotational energy transfer. The I* is only about 0.92 eV above the ground state and this energy excess hardly contributes to the already low reactivity of the iodine atom in gas phase. Actually, there are few systems in which reactive quenching of I* is present (i.e., interhalogens, ozone) [1 -4].Extensive studies have been carried out measuring quenching efficiencies of several compounds on the ABSTRACTThe deactivation of I( 2 P 1/2 ) by R-OH compounds (R ϭ H, C n H 2nϩ1 ) was studied using time-resolved atomic absorption at 206.2 nm. The second-order quenching rate constants determined for H 2 O, CH 3 OH, C 2 H 5 OH, n-C 3 H 7 OH, i-C 3 H 7 OH, n-C 4 H 9 OH, i-C 4 H 9 OH, s-C 4 H 9 OH, t-C 4 H 9 OH, are respectively, 2.4 Ϯ 0.3 ϫ 10 Ϫ12 , 5.5 Ϯ 0.8 ϫ 10 Ϫ12 , 8 Ϯ 1 ϫ 10 Ϫ12 , 10 Ϯ 1 ϫ 10 Ϫ12 , 10 Ϯ 1 ϫ 10 Ϫ12 , 11.1 Ϯ 0.9 ϫ 10 Ϫ12 , 9.8 Ϯ 0.9 ϫ 10 Ϫ12 , 7.1 Ϯ 0.7 ϫ 10 Ϫ12 , and 4.1 Ϯ 0.4ϫ 10 Ϫ12 cm 3 molec Ϫ1 s Ϫ1 at room temperature. It is believed that a quasi-resonant electronic to vibrational energy transfer mechanism accounts for most of the features of the quenching process. The influence of the alkyl group and its role in the total quenching rate is also discussed.

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“…Reaction Reaction rate constants/cm 3 s -1 1 O 2 (a) + I ® О 2 (X) + I * k 1f = 7.6 ´ 10 -11 [12] О 2 (X) + I * ® O 2 (a) + I k 1b = k 1f /K e , K e = 2.85 2 I 2 + O 2 (b) ® 2I + О 2 (X) k 2 = 10 -10 [13] 3 I * + I 2 ® I + I 2 * k 3 = 3.6 ´ 10 -11 [14] 4…”

Section: Reaction Numbermentioning

confidence: 99%

Kinetics of an oxygen – iodine active medium with iodine atoms optically pumped on the²P_1/2–²P_3/2transition

Загидуллин¹,

Malyshev²,

Azyazov³

2015

Quantum Electron.

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The kinetics of the processes occurring in an O 2 -I 2 -He -H 2 O gas flow in which photodissociation of molecular iodine at a wavelength close to 500 nm and excitation of atomic iodine on the 2 P 1/2 -2 P 3/2 transition by narrow-band radiation near 1315 nm are implemented successively has been analysed. It is shown that implementation of these processes allows one to form an oxygen -iodine medium with a high degree of dissociation of molecular iodine and a relative content of singlet oxygen O 2 (a 1 D) exceeding 10 %. Having formed a supersonic gas flow with a temperature ~100 K from this medium, one can reach a small-signal gain of about 10 -2 cm -1 on the 2 P 1/2 -2 P 3/2 transition in iodine atoms. The specific power per unit flow cross section in the oxygen -iodine laser with this active medium may reach ~100 W cm -2 .

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Collisional quenching of excited iodine atoms I(5p5 2P1/2) by selected molecules

Abstract: Articles you may be interested inConservation of the Kr+(2 P 1/2) state in the reactive quenching of Kr(5s′[1/2]0) atoms by halogencontaining molecules

Cited by 58 publications

References 9 publications

Theoretical feasibility study of new high-efficiency continuous-wave lasers operating at electron transitions in the spectral regions from near ir to uv on the basis of unconventional mechanisms of forming the active gaseous media

Theoretical feasibility study of new high-efficiency continuous-wave lasers operating at electron transitions in the spectral regions from near ir to uv on the basis of unconventional mechanisms of forming the active gaseous media

Quenching of I(2P�) by R-OH compounds. Influence of the alkyl group on the quenching efficiency

Kinetics of an oxygen – iodine active medium with iodine atoms optically pumped on the²P_1/2–²P_3/2transition

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Collisional quenching of excited iodine atoms I(5p5 2P1/2) by selected molecules

Abstract: Articles you may be interested inConservation of the Kr+(2 P 1/2) state in the reactive quenching of Kr(5s′[1/2]0) atoms by halogencontaining molecules

Cited by 58 publications

References 9 publications

Theoretical feasibility study of new high-efficiency continuous-wave lasers operating at electron transitions in the spectral regions from near ir to uv on the basis of unconventional mechanisms of forming the active gaseous media

Theoretical feasibility study of new high-efficiency continuous-wave lasers operating at electron transitions in the spectral regions from near ir to uv on the basis of unconventional mechanisms of forming the active gaseous media

Quenching of I(2P�) by R-OH compounds. Influence of the alkyl group on the quenching efficiency

Kinetics of an oxygen – iodine active medium with iodine atoms optically pumped on the2P1/2–2P3/2transition

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Kinetics of an oxygen – iodine active medium with iodine atoms optically pumped on the²P_1/2–²P_3/2transition