Multiple Photon IR Laser Photophysics and Photochemistry. V

Баграташвили, В.Н.; Letokhov, V. S.; Макаров, А. А.; Ryabov, E. A.

doi:10.1155/lc.5.53

Cited by 81 publications

(141 citation statements)

References 23 publications

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“…The energy fluence in the excitation zone was up to 8 J/cm 2. At such energy fluence the dissociation yield of CF3I is practically equal to unit [11,14].…”

Section: The Relation Between the Parameters Of The Separation Procesmentioning

confidence: 99%

“…The important problem in laser isotope separation by the IR MPD of molecules [1,2] is increase of selectivity, especially in the case of molecules with a small isotope shift (like OsO4, UF6...).…”

Section: Introductionmentioning

confidence: 99%

“…In [8][9][10][11][12]. The IR multiphoton absorption of CF3I was also investigated [13] under molecular beam conditions.…”

Section: Introductionmentioning

confidence: 99%

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Single Pulse Carbon‐13 Enrichment of CF₃ Under IR MPD in A ShortGas Dynamic Flow

1998

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An experimental approach is described for obtaining highly enriched residual gas under IR multiphoton dissociation (MPD) of molecules in one cycle of irradiation. The approach is based on utilization of a pulsed molecular flow of small length (Axn <_ cm).The use of a short flow length leads to high values of the dissociation yield of molecules (/3 _ _ _ 1) in the whole volume of the flow. Owing to this, high enrichment of the residual gas is achieved in one cycle of irradiation. The isotopically-selective dissociation of CF3I in the pulsed gasdynamic flow of a small length was studied. About 400-fold enrichment of the 13C isotope in the residual gas was obtained following irradiation of a molecular flow of CF3I of natural isotope composition by a single laser pulse. The selectivity of dissociation was measured to be c > 10.

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“…The energy fluence in the excitation zone was up to 8 J/cm 2. At such energy fluence the dissociation yield of CF3I is practically equal to unit [11,14].…”

Section: The Relation Between the Parameters Of The Separation Procesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Single Pulse Carbon‐13 Enrichment of CF₃ Under IR MPD in A ShortGas Dynamic Flow

1998

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“…laser light, can induce isomerization or fragmentation in complex molecules. Due to the different multiphoton absorption spectra, it is possible to select a specific reactant from a reaction mixture and to obtain products in a proportion different from their equilibrium ratio [1][2][3]. However, when the selected reactant has more than one reaction pathway, then the internal energy distribution after excitation is important in selecting the preferred reaction.…”

Section: Introductionmentioning

confidence: 99%

I.R. laser chemistry of allyl phenyl ether

Benmair

Yogev

1987

Molecular Physics

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The Claisen rearrangement of allyl phenyl ether to 2-allyl phenol has been investigated by I.R. multiphoton excitation. While the thermal reaction of the same starting material yields only the Claisen isomerization product, the I.R. photochemical excitation initiates both fragmentation and isomerization reactions. The dependence of product distribution on fluence is different at various wavelengths. Two mechanisms are proposed for the I.R. photochemical reaction. One assumes selective absorption, the other assumes wavelength dependent competition between absorption and stimulated emission of the vibrationally excited reaction intermediates.

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“…l Since then, the absorption of large numbers of monochromatic infrared photons by single molecules has been studied extensively. [2][3][4][5][6][7] Because of the selectivity of vibrational excitation, infrared multiphoton excitation has received much attention. Initially it was hoped that a "bond-selective" or "mode-selective" photochemistry based on infrared multiphoton excitation could be developed.…”

mentioning

confidence: 99%

Nonthermal Intramolecular Vibrational Energy Distribution in Infrared-Multiphoton-Excited CF2Cl2

1987

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The intramolecular vibrational energy distribution of infrared-multiphoton-excited CF2CI2 molecules is studied with time-resolved spontaneous Raman scattering. The time evolution of the signals from three vibrational modes is studied up to 600 ns after excitation, and in the presence of N2 buffer gas. Following collisionless infrared multiphoton excitation a nonthermal distribution of vibrational energy is observed. This nonequilibrium distribution persists up to high levels of vibrational excitation, with at least 10000 cm -1 in three out of the nine vibrational modes.

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Multiple Photon IR Laser Photophysics and Photochemistry. V

Abstract: This paper ends the series of reviews on multiple photon IR laser photophysics and photochemistry. The applications of IR MP processes in fundamental chemical studies and chemical technology are considered.

Cited by 81 publications

References 23 publications

Single Pulse Carbon‐13 Enrichment of CF₃ Under IR MPD in A ShortGas Dynamic Flow

Single Pulse Carbon‐13 Enrichment of CF₃ Under IR MPD in A ShortGas Dynamic Flow

I.R. laser chemistry of allyl phenyl ether

Nonthermal Intramolecular Vibrational Energy Distribution in Infrared-Multiphoton-Excited CF2Cl2

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Multiple Photon IR Laser Photophysics and Photochemistry. V

Abstract: This paper ends the series of reviews on multiple photon IR laser photophysics and photochemistry. The applications of IR MP processes in fundamental chemical studies and chemical technology are considered.

Cited by 81 publications

References 23 publications

Single Pulse Carbon‐13 Enrichment of CF3 Under IR MPD in A ShortGas Dynamic Flow

Single Pulse Carbon‐13 Enrichment of CF3 Under IR MPD in A ShortGas Dynamic Flow

I.R. laser chemistry of allyl phenyl ether

Nonthermal Intramolecular Vibrational Energy Distribution in Infrared-Multiphoton-Excited CF2Cl2

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Product

Resources

About

Single Pulse Carbon‐13 Enrichment of CF₃ Under IR MPD in A ShortGas Dynamic Flow

Single Pulse Carbon‐13 Enrichment of CF₃ Under IR MPD in A ShortGas Dynamic Flow