Laser ultraviolet fragmentation of homogeneous (CF3I) n clusters in a molecular beam and (CF3I) n clusters inside of large (Xe) m clusters or on their surface

Апатин, В. М.; Лохман, В. Н.; Макаров, Г. Н.; Ogurok, D. D.; Петин, А. Н.; Ryabov, E. A.

doi:10.1134/s0021364013120035

Cited by 14 publications

(21 citation statements)

References 39 publications

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“…The energy absorbed by SF 6 molecules almost monotonically increases with the excitation energy density. This character of gaining energy by molecules was observed in many earlier works on the multiphoton IR excitation of SF 6 (see, e.g., [48,49,51,52] and therein). The E res (Φ) dependences that are shown in Fig.…”

Section: Resultssupporting

confidence: 69%

“…For example, when SF 6 molecules are excited at laser line 10P(16) (947.74 cm -1 ) and an energy density Φ ≈ 0.6 J/cm 2 (at which molecules become free after cluster disintegration and a signal is induced in the detector), on average 5-6 laser radia tion quanta, i.e., 0.6-0.7 eV, are absorbed by each molecule [48,49,51,52]. Some molecules absorbed a higher energy.…”

Section: Resultsmentioning

confidence: 99%

“…The possibil ity of doping clusters by molecules (or atoms) due to the trapping of molecules by clusters from an inter secting molecular beam or during the passage of a cluster beam through a cell with a molecular gas signif icantly widens the filed of application of molecular and cluster beams [24,25]. For example, this opens up fresh opportunities for spectroscopy and studying clusters [24][25][26][27][28][29][30][31] and the elementary processes that occur inside clusters or on their surface [28,[30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…To separate cluster and molecular beams from the pulsed jets generated with these nozzles, we used conic apertures (skimmers) having an inlet hole diam eter of 3 and 6 mm, respectively, and located at a dis tance of 30 and 26 mm from the nozzles, respectively. Molecular and cluster beams were detected using uncooled pyroelectric detectors (PEDs) with a time resolution of 5-10 μs and an active element area of 4 × 4 mm 2 [48,49]. PEDs were placed at various dis tances from the nozzles.…”

Section: Introductionmentioning

confidence: 99%

“…A laser was used to excite molecular vibration v 3 (948 cm -1 ), which is active in the IR region [50]. The excitation of molecules was studied by the pyroelectric method of detecting the absorbed energy [48,49,51,52]. The signal induced by molecular and cluster beams in PED was amplified (by approximately two orders of magnitude) and transferred to a Tektronix TDS 1002 oscilloscope.…”

Section: Introductionmentioning

confidence: 99%

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Disintegration of Ar N , Kr N , and (N2) N clusters during collisions with highly vibrationally excited SF6 molecules

Макаров

Петин

2014

J. Exp. Theor. Phys.

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It is shown that, when highly vibrationally excited SF 6 molecules (with vibrational energy E vib ≥ 0.5-2 eV) collide with weakly bound van der Waals Ar N , Kr N , or (N 2 ) N (N ≤ 30-40 atoms in a cluster) clusters in intersecting molecular and cluster beams, the molecules are trapped by the clusters, the clusters then undergo full disintegration, and the trapped molecules become free. The method of studying this process and the results obtained are described. The possibilities of application of this method for selective doping of clus ters by molecules, laser separation of isotopes, and selective transportation of molecules to a surface are dis cussed.

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Section: Resultssupporting

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Disintegration of Ar N , Kr N , and (N2) N clusters during collisions with highly vibrationally excited SF6 molecules

Макаров

Петин

2014

J. Exp. Theor. Phys.

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Ultrafast Dissociation Dynamics Induced in [Fe(CO)₅]_nXe_m Mixed Clusters by Resonant Femtosecond Infrared Laser Radiation

2022

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Real-time dissociation dynamics induced in [Fe(CO)5] n Xe m mixed molecular clusters by femtosecond IR radiation in the 5 μm region was studied for the first time by means of time-resolved methods based on resonant excitation of CO vibrations in the molecular core of the cluster and photoionization probing (λ = 400 nm) of its decay products. It was found that IR-excited clusters in the initially cold particle beam are heated and dissociated as a result of relaxation processes, giving rise to free neutral Xe aggregates and Fe(CO)5 molecules. Thus, the formed particles are the origin of signal variations from Xe+ and Fe(CO)5 + ions, which grow on a picosecond time scale. It is concluded that the initial laser excitation of CO vibrations in clusterized molecules is followed by the process of cluster dissociation accompanied with the formation of free neutral particles according to the hierarchy of binding energies: weakly bound shells of Xe atoms are evaporated first and much faster than the Fe(CO)5 molecules from the cluster core. The characteristic times of relaxation processes as well as the cluster temperature were estimated.

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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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Laser ultraviolet fragmentation of homogeneous (CF3I) n clusters in a molecular beam and (CF3I) n clusters inside of large (Xe) m clusters or on their surface

Cited by 14 publications

References 39 publications

Disintegration of Ar N , Kr N , and (N2) N clusters during collisions with highly vibrationally excited SF6 molecules

Disintegration of Ar N , Kr N , and (N2) N clusters during collisions with highly vibrationally excited SF6 molecules

Ultrafast Dissociation Dynamics Induced in [Fe(CO)₅]_nXe_m Mixed Clusters by Resonant Femtosecond Infrared Laser Radiation

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

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Laser ultraviolet fragmentation of homogeneous (CF3I) n clusters in a molecular beam and (CF3I) n clusters inside of large (Xe) m clusters or on their surface

Cited by 14 publications

References 39 publications

Disintegration of Ar N , Kr N , and (N2) N clusters during collisions with highly vibrationally excited SF6 molecules

Disintegration of Ar N , Kr N , and (N2) N clusters during collisions with highly vibrationally excited SF6 molecules

Ultrafast Dissociation Dynamics Induced in [Fe(CO)5]nXem Mixed Clusters by Resonant Femtosecond Infrared Laser Radiation

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

Contact Info

Product

Resources

About

Ultrafast Dissociation Dynamics Induced in [Fe(CO)₅]_nXe_m Mixed Clusters by Resonant Femtosecond Infrared Laser Radiation

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