Atomic iodine production in a gas flow by decomposing methyl iodide in a dc glow discharge

Mikheyev, P. A.; Shepelenko, A. A.; Voronov, A I; Kupryaev, N. V.

doi:10.1070/qe2002v032n01abeh002115

Cited by 24 publications

(21 citation statements)

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“…In the COIL medium, iodine atoms will undergo excitation according to reaction (2). In addition, the recombination of iodine atoms takes place in termolecular reactions with carrier gas, molecular iodine, and above all with NO 2 molecules.…”

Section: Generation Of Iodine Atomsmentioning

confidence: 99%

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Chemical oxygen-iodine laser with a new method of atomic iodine generation

Špalek

Čenský

Jirásek

et al. 2003

Gas and Chemical Lasers and Intense Beam Applications IV

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A study of recently proposed chemical method of atomic iodine production in the Chemical Oxygen-Iodine Laser (COIL) was performed. The process using gaseous reactants is based on the fast reaction of hydrogen iodide with chemically produced atomic chlorine. In the absence of singlet oxygen, the high yield of atomic iodine was attained (80 to 100 %). In the flow of singlet oxygen, the gain of 0.32 % cm -1 on 3-4 transition in iodine atom was achieved. It was found that both the rate of atomic iodine generation and gain depend substantially on mixing conditions of reacting gases. In laser experiments, effects of ratio of reactants, and their dilution by nitrogen on the laser output power were studied. The output power of 285 W was attained at chlorine flow rate of 27 mmol s -1 corresponding to chemical efficiency of 11.7 %. It was the first time when gain and laser output power were achieved in the COIL with atomic iodine generated by the proposed method.

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Section: Generation Of Iodine Atomsmentioning

confidence: 99%

“…To increase the COIL efficiency, and suppress or avoid further problems, several methods of atomic iodine generation were proposed as I 2 dissociation in microwave discharge 1 , or dissociation of methyl iodide in dc glow discharge. 2 These methods, however, were effective only partly up to now.…”

Section: Introductionmentioning

confidence: 97%

Chemical oxygen-iodine laser with a new method of atomic iodine generation

Špalek

Čenský

Jirásek

et al. 2003

Gas and Chemical Lasers and Intense Beam Applications IV

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“…Electric-discharge [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and chemical [18][19][20] generators have been proposed as a source of iodine atoms for the use in OIL. Dissociation of iodine-containing molecules in electric-discharge plasmas had been proved to be useful for external production of iodine atoms.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous losses of externally generated I atoms for OIL

Torbin

Mikheyev

Ufimtsev

et al. 2013

XIX International Symposium on High-Power Laser Systems and Applications 2012

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Usage of an external iodine atom generator can improve energy efficiency of the oxygen-iodine laser (OIL) and expand its range of operation parameters. However, a noticeable part of iodine atoms may recombine or undergo chemical bonding during transportation from the generator to the injection point. Experimental results reported in this paper showed that uncoated aluminum surfaces readily bounded iodine atoms, while nickel, stainless steel, Teflon or Plexiglas did not. Estimations based on experimental results had shown that the upper bound of probability of surface iodine atom recombination for materials Teflon, Plexiglas, nickel or stainless steel is γ rec ≤ 10 -5 .

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“…High iodine atom densities of ∼ 10 16 cm −3 have been achieved in dc glow discharges [36][37][38]. However, in achieving these densities through discharge, relatively high pressures (∼few tens of Torr) of both the precursor (I 2 , CH 3 I) and carrier gases (He, Ar) are required.…”

Section: Experimental Feasibility -mentioning

confidence: 99%

Calculation of parity-nonconserving optical rotation in iodine at 1315 nm

et al. 2013

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We examine the feasibility of a parity non-conserving (PNC) optical rotation experiment for the 2 P 3/2 → 2 P 1/2 transition of atomic iodine at 1315 nm. The calculated E1PNC to M 1 amplitude ratio is R = 0.80(16) × 10 −8 . We show that very large PNC rotations (greater than 10 µrad) are obtained for iodine-atom column densities of ∼ 10 22 cm −2 , which can be produced by increasing the effective interaction pathlength by a factor of ∼ 10 4 with a high-finesse optical cavity. The simulated signals indicate that measurement of the nuclear anapole moment is feasible, and that a 1% PNC precision measurement should resolve the inconsistency between previous measurements in Cs and Tl. [5][6][7][8]. The highlight of these efforts was the 0.35% precision measurement of nuclear-spin-independent PNC in Cs, and the 14% precision measurement of the nuclear spin-dependent PNC for the odd-proton nucleus of 133 Cs [4]. However, measurement of the anapole moment in Cs disagrees with Tl [4,5], and also with some theoretical nuclear calculations ([9-11] and references therein). To help resolve these inconsistencies, and to improve the atomic PNC tests of the standard model, further experiments are needed. For example, there is a proposal to measure the nuclear anapole moment using the PNC-generated hyperfine frequency shift of dressed states in atoms [12], with particular proposals for Cs [13] and Fr [14]. However, for other PNC candidates, as the precision in the atomic theory is not expected to significantly surpass the current experimental or theoretical PNC precision of Cs, future PNC experiments have focused on other fruitful directions, such as the measurement of atomic PNC on a chain of isotopes [9,15], or the measurement of nuclear anapole moments. Therefore, along these lines, PNC experiments are in progress on Yb and Dy at Berkeley [16,17], on Rb and Fr at the Tri-University Meson Facility (TRIUMF, University of British Columbia) [18,19], on Ra + at KVI Groningen [20], and on Ba + at the University of Washington, Seattle [21]. Recently, Bougas et al.

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Atomic iodine production in a gas flow by decomposing methyl iodide in a dc glow discharge

Cited by 24 publications

References 0 publications

Chemical oxygen-iodine laser with a new method of atomic iodine generation

Chemical oxygen-iodine laser with a new method of atomic iodine generation

Heterogeneous losses of externally generated I atoms for OIL

Calculation of parity-nonconserving optical rotation in iodine at 1315 nm

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