Production of iodine atoms by dissociating CH<sub>3</sub>I and HI in a dc glow discharge in the flow of argon

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

doi:10.1088/0022-3727/37/22/024

Cited by 20 publications

(17 citation statements)

References 15 publications

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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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Section: Experimental Feasibility -mentioning

confidence: 99%

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

et al. 2013

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“…The alkyl halide was chosen over I as it is more convenient to handle, dissociates efficiently in discharges, and the fragmentation products do not quench I*. Mikheyev et al [86] have demonstrated 100% dissociation of CH I in this system. In tests where the discharge products were injected in to a cold primary flow (room temperature Ar), Azyazov et al [79,80] observed loss of I atoms due to homogeneous recombination.…”

Section: Iodine Dissociationmentioning

confidence: 99%

Recent advances in the development of discharge‐pumped oxygen‐iodine lasers

Heaven

2010

Laser & Photonics Reviews

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Chemical oxygen-iodine lasers are unique in their ability to generate high-power beams with near diffraction limited beam quality. The operating wavelength, 1.315 μm is readily transmitted by the atmosphere and compatible with fiber optics beam delivery systems. However, applications of the laser are severely limited by logistical problems associated with the complex chemistry used to power the device. Electrical or microwave discharge excitation of oxygen-iodine lasers offers an attractive alternative that eliminates the chemical power generation problems and has the possibility of closedcycle operation. A discharge oxygen-iodine laser was first demonstrated in 2005. Since that time the power of the device has been improved by a factor of 400 and much has been learned concerning the physics and chemistry of the discharge driven system. Although our current understanding of the chemical kinetics is incomplete, parametric studies of laser performance show considerable promise for further scaling. This article reviews the basic principles of the discharge oxygen iodine laser, summarizes the most recent advances, and outlines some of the unresolved questions regarding the production and removal of excited species in the gas flow.

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“…8. A distinguishing feature of this generator is the lower than usual electric field in the discharge plasma due to a small interelectrode gap of just 4 mm.…”

Section: A Iodine Atom Generatormentioning

confidence: 99%

Properties of O2(Δ1)–I(P21/2) laser medium with a dc glow discharge iodine atom generator

Mikheyev

Azyazov

2008

Journal of Applied Physics

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Experiments were carried out in a flow cell apparatus under conditions corresponding to those of a typical oxygen-iodine laser. The cell was equipped with a chemical jet type singlet oxygen generator and an electric discharge for the production of iodine atoms. The properties of the discharge generator and the active medium were studied using laser-induced fluorescence and emission spectroscopy. I2 or CH3I entrained in a carrier flow of Ar were used as atomic iodine precursors. About 50% of the iodine contained in CH3I molecules was extracted in the generator. 2.6% of the electric power loaded into the discharge was used in CH3I dissociation. Right after the discharge 80%–90% of the iodine flow consisted of atoms. However, due to recombination during transport, only 20%–50% of atoms remained at the point of injection into the oxygen flow. A straightforward comparison of two methods of oxygen-iodine medium production—conventional, by means of I2 dissociation in the singlet oxygen flow and with iodine atoms produced externally in the electric discharge—was performed. It was found that the lifetime for the energy stored in singlet oxygen was about 30% longer, when atomic iodine was produced from CH3I in the discharge, as compared to the conventional chemical dissociation of I2 in the singlet oxygen flow.

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Production of iodine atoms by dissociating CH₃I and HI in a dc glow discharge in the flow of argon

Cited by 20 publications

References 15 publications

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

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

Recent advances in the development of discharge‐pumped oxygen‐iodine lasers

Properties of O2(Δ1)–I(P21/2) laser medium with a dc glow discharge iodine atom generator

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Production of iodine atoms by dissociating CH3I and HI in a dc glow discharge in the flow of argon

Cited by 20 publications

References 15 publications

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

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

Recent advances in the development of discharge‐pumped oxygen‐iodine lasers

Properties of O2(Δ1)–I(P21/2) laser medium with a dc glow discharge iodine atom generator

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Production of iodine atoms by dissociating CH₃I and HI in a dc glow discharge in the flow of argon