Influence of laser radiation on electron capture by molecules

Бетеров, И. И.; Chebotaev, V. P.; Fateev, N. V.; Yakovin, D. V.

doi:10.1070/qe1978v008n04abeh010076

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…These excited molecules then dissociate into two free atoms, one in the excited state Na*(3p) and the other in the ground state Na(3s). In the third step, the excited atoms are subsequently ionized either due to collisions with the buffer gas atoms or sodium atoms or by absorbing a third photon from the same laser pulse (Beterov et al 1983). Photodissociation of the sodium dimer contributes to build up the population in the 3p atomic state while photoionization decreases it.…”

Section: Multiphoton Dissociation and Ionizationmentioning

confidence: 99%

Resonantly enhanced ns and nd Rydberg spectroscopy of sodium

Baig

Akram

Piracha

et al. 1995

J. Phys. B: At. Mol. Opt. Phys.

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We report new observations of photodissociation and ionization in sodium vapour by using a Nd:YAG pumped dye laser and a thermionic diode as an ion detector employing two experimental geometries. In the first experiment, single photon dissociation of a sodium dimer into an excited atomic state followed by a one-photon excitation to even parity Rydberg states of atomic sodium has been investigated. In the second arrangement, we used a two-colour two-step excitation process which yields much higher Rydberg members of the even parity ns 2S1/2 and nd 2D3/2,5/2 series. The relative intensities of the ns and nd members of the Rydberg series are attributed to the spatial overlap between the 3p and ns and nd wavefunctions, evidenced by the ab initio single configuration Hartree-Fock calculations.

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Section: Multiphoton Dissociation and Ionizationmentioning

confidence: 99%

Resonantly enhanced ns and nd Rydberg spectroscopy of sodium

Baig

Akram

Piracha

et al. 1995

J. Phys. B: At. Mol. Opt. Phys.

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“…Pi,it = £ fd^W (5) where Px is the probability of an electronic transition from state II to II', P2 is the Landau-Zener-type curve-crossing probability from state I to II', and P3(u-) is the probability for the excitation of the jth phonon, or electron-hole pair, with energy Kj -hu>j and density of states p(coj), where Kj is the initial kinetic energy. The overall sticking probability or transition probability Py\y can be enhanced by laser radiation via two channels (12): (i) electronic excitation of the adspecies potential, i.e., the transition probability Pi, and (ii) vibrational excitation within the electronically excited state II', which compensates the energy mismatch Kj ft to, and in turn increases the diabatic curve-crossing probability P2 and the energy transfer probability P3 via the surface excitations.…”

Section: Golden-rule-type Expressionmentioning

confidence: 99%

Theory of laser-induced surface chemistry with applications to microelectronics and heterogeneous catalysis

Lin¹,

Murphy²,

George³

1984

Ind. Eng. Chem. Prod. Res. Dev.

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Theory and experiments are reviewed for how laser radlation can stimulate various component mechentsms which contribute to the complex chemistry involved in heterogeneous catalysis. These mechanisms include the processes of adsorptlon, desorption, migration, and chemical reactions at a gas-solid interface. Applications of laser-induced surface chemistry to rnicrodectmics In drcuit deposbn, lithography, annealing, and flnal testlng of the circuit are discussed. In addition to the review, some new theory Is presented.Ceramic thermal barrier coating research is reviewed in periods from the early 1950's through the early 1970's, from the seventies to the eighties, and for the past few years. Recent major developments include use of ceramic coatings on various components of gas turbine engines such as first-stage turbine vane platforms of advanced production engines, uncooled integrally bladed turbine wheel rims, and cooled combustion transition sections. These developments have been realized through improvements in coating materials and processing conditions and through heat transfer and aerodynamic analysis. Future improvements will be facilitated when coating failure mechanisms are more fully understood. Current understanding of failure mechanisms is reviewed.

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“…1we see that there are two contributions of the upper-level coherence which modify the usual gain or absorption. The first is the dynamical Stark effect [7], studied theoretically and experimentally in a V-type configuration in [3]; it is responsible for the jV c j 2 term in the denominator.…”

mentioning

confidence: 99%