Studies on high-intensity pulsed molecular beams and flows interacting with a solid surface

Макаров, Г. Н.

doi:10.3367/ufnr.0173.200309a.0913

Cited by 28 publications

(2 citation statements)

References 98 publications

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“…Interest in the SF 6 molecule is primarily due to the fact that, with respect to its structure and spectroscopic characteristics, it is a prototype of a UF 6 molecule. The SF 6 molecule was studied in considerable detail both with respect to its spectr oscopy [30][31][32][33][34] and with respect to its excitation and dissociation by IR laser radiation [11][12][13][14][15]. In addition, the IR absorption of small (SF 6 ) m clusters (m ⩽ 6) near the absorption band of laser-excited vibration ν 3 (948 cm −1 ) of the molecule was studied [35].…”

Section: Laser Physicsmentioning

confidence: 99%

“…At the present time, quite a lot of research has been carried out into the development of low-energy laser isotope separation methods [1][2][3][4][5][6][7][8][9][10]. Alternative methods have also been proposed and studied [11,12]. The main objective of these studies was to find efficient and economical methods for separating uranium isotopes, as well as isotopes of other elements.…”

Section: Introductionmentioning

confidence: 99%

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Isotope-selective control of the clusterization of SF₆molecules by an IR laser during gasdynamic expansion of an SF₆/Ar mixture

et al. 2018

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We present the results of our investigation into the isotope-selective control of the clusterization of SF 6 molecules during their gasdynamic expansion in a mixture with an argon carrier gas using IR laser radiation. The method is based on the selective vibrational excitation of molecules of a chosen isotopic composition by an IR laser near the nozzle edge, which leads to the suppression of their clusterization with each other and with argon atoms. The experimental setup and the method of investigation are described. Results are presented on determining the efficiency and the selectivity of the clusterization suppression of molecules at different gas compositions above the nozzle, as well as at different distances of the irradiation region of particles from the nozzle edge. Dependences of the clusterization suppression efficiency on the frequency and power of the exciting laser radiation are obtained. Experiments on the selective suppression of the clusterization of SF 6 molecules in mixtures with other carrier gases have also been performed. It is found that controlling the clusterization process of SF 6 molecules in a mixture with the argon carrier gas makes it possible to achieve relatively high selectivity values. Thus, in the case of using an SF 6 /Ar mixture at a 1/200 pressure ratio, the obtained selectivity of the clusterization suppression of 32 SF 6 molecules with respect to 34 SF 6 molecules under jet irradiation at the 10P(16) CO 2 laser line (at a frequency of 947.74 cm −1 ) was α( 32 SF 6 / 34 SF 6 ) 10−20. Conditions are found under which optimal values of the efficiency and selectivity of the clusterization suppression of molecules are realized.

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Section: Laser Physicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Isotope-selective control of the clusterization of SF₆molecules by an IR laser during gasdynamic expansion of an SF₆/Ar mixture

et al. 2018

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The possibility of selection of molecules embedded in superfluid helium nanodroplets

Лохман

Макаров

2004

Chemical Physics Letters

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Infrared laser-induced isotope-selective dissociation of mixed (CF₃Br)_mAr_nvan der Waals clusters

Петин¹,

Макаров²

2019

Quantum Electron.

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The paper presents the results of studies of IR laser-induced bromine-isotope-selective dissociation of small mixed (CF3Br) m Ar n van der Waals clusters (m = 1, 2 and 1 ≤ n ≤ 5 is the number of molecules and atoms in the clusters, respectively). The experiments used a pulsed CO2 laser to excite clusters and a quadrupole mass spectrometer to detect a molecular cluster beam. The research method is based on the selective vibrational excitation of clusters by IR laser radiation, leading to their predissociation. The possibilities of implementing bromine-isotope-selective dissociation of clusters are considered. The experimental setup and research method are briefly described. The results of determining the cluster dissociation efficiency and selectivity as functions of the energy and frequency of laser radiation are presented. It is shown that resonant vibrational excitation of clusters makes it possible to induce their isotope-selective dissociation. Thus, using a CF3Br/Ar mixture with a pressure ratio of 1/200, the enrichment factors of the 79Br isotope are found to be K enr(79Br) = 1.15 ± 0.04 and 0.95 ± 0.03 under cluster irradiation conditions on the 9R(30) (ν = 1084.635 cm−1) and 9R(24) (ν = 1081.087 cm−1) lines, respectively The achieved dissociation selectivities for the clusters are, respectively, 1.16 ± 0.05 and 0.95 ± 0.04. The results obtained suggest that this method can be used to separate isotopes in molecules containing isotopes of heavy elements, which have a slight isotopic shift in the IR absorption spectra.

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Studies on high-intensity pulsed molecular beams and flows interacting with a solid surface

Cited by 28 publications

References 98 publications

Isotope-selective control of the clusterization of SF₆molecules by an IR laser during gasdynamic expansion of an SF₆/Ar mixture

Isotope-selective control of the clusterization of SF₆molecules by an IR laser during gasdynamic expansion of an SF₆/Ar mixture

The possibility of selection of molecules embedded in superfluid helium nanodroplets

Infrared laser-induced isotope-selective dissociation of mixed (CF₃Br)_mAr_nvan der Waals clusters

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Studies on high-intensity pulsed molecular beams and flows interacting with a solid surface

Cited by 28 publications

References 98 publications

Isotope-selective control of the clusterization of SF6molecules by an IR laser during gasdynamic expansion of an SF6/Ar mixture

Isotope-selective control of the clusterization of SF6molecules by an IR laser during gasdynamic expansion of an SF6/Ar mixture

The possibility of selection of molecules embedded in superfluid helium nanodroplets

Infrared laser-induced isotope-selective dissociation of mixed (CF3Br)mArnvan der Waals clusters

Contact Info

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Isotope-selective control of the clusterization of SF₆molecules by an IR laser during gasdynamic expansion of an SF₆/Ar mixture

Isotope-selective control of the clusterization of SF₆molecules by an IR laser during gasdynamic expansion of an SF₆/Ar mixture

Infrared laser-induced isotope-selective dissociation of mixed (CF₃Br)_mAr_nvan der Waals clusters