Investigation of the Gas Laser

Басов, Н. Г.; Belenov, É. M.; Markin, E. P.; Никитин, В. В.; Ораевский, А. Н.

doi:10.1007/978-1-4684-9972-8_4

Cited by 3 publications

(7 citation statements)

References 14 publications

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“…45 • 48 Rates into specific vibrational-rotational states can then be obtained directly from the initial distributions and k(v', 1') cx: .N(v', 1'). (4) These relative rate constants k(v', 1') are given in Figs. 6 and 7 for CI+HI and CI+DI, respectively.…”

Section: Discussionmentioning

confidence: 99%

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Energy Distribution Among Reaction Products. IV. X+HY (X ≡ Cl, Br; Y ≡ Br, I), Cl+DI

Maylotte

Polanyi

Woodall

1972

The Journal of Chemical Physics

190

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The distribution of vibrational, rotational, and translational energies (symbolized by V′, R′, and T′) have been obtained for the products of the isotopic pair of reactions Cl + HI → HCl + I and Cl + DI → DCl + I. The experimental method was the ``arrested relaxation'' variant of the infrared chemiluminescence technique. Detailed rate constants k(V′, R′, T′) are reported in the form of contour plots for these reactions. The total detailed rate constants into specified vibrational quantum states for Cl+HI (summed over the rotational levels of each v′ level) are k(v′ = 1) = 0.22, k(v′ = 2) = 0.35, [k(v′ = 3) = 1.00], k(v′ = 4) = 0.74; and for Cl + DI, k(v′ = 1) ≈ 0.08, k(v′ = 2) = 0.14, k(v′ = 3) = 0.35, k(v′ = 4) = 0.73, [k(v′ = 5) = 1.00], k(v′ = 6) = 0.05 [relative to the highest rate constant k(v̂′) = 1.00, in each case]. Preliminary energy distributions are also reported for the products of two other reactions, Cl + HBr → HCl + Br and Br + HI → HBr + I, in the X + HY → HX + Y family (X and Y are halogen atoms). The members of this family of reactions channel a substantial fraction of the energy available to the products into vibrational and rotational excitation, and only a small fraction into relative translation. For the Cl+HI and also the Cl+DI reaction the fractions are f̄V′ + f̄R′ (= 0.71 + 0.13) = 0.84; in contrast to f̄T′ = 0.16. As a corollary there is a marked inverse correlation between vibrational and rotational excitation in the reaction products. Despite the fact that the detailed rate constants into specified product quantum states [k(v′, J′)] are markedly different for the isotopic pair of reactions, the fractional conversion of the available energy into vibration, rotation, and translation are in close agreement (to ∼ ± 1%). This close parallelism in f̄V′, f̄R′, f̄T′ is in accord with predictions from classical trajectory studies. It indicates the usefulness of such calculations even for the case of reactions which yield products with widely spaced (vibrational and rotational) quantum levels.

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Section: Discussionmentioning

confidence: 99%

“…[3][4][5]. Figure 3 shows the CI+ HI rotational distribution in vibrational level v' =3 from Experiments 1-3.…”

Section: The Vibrational Populations Inmentioning

confidence: 99%

Energy Distribution Among Reaction Products. IV. X+HY (X ≡ Cl, Br; Y ≡ Br, I), Cl+DI

Maylotte

Polanyi

Woodall

1972

The Journal of Chemical Physics

190

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“…Notice that the laser does not immediately start to amplify after threshold is reached, but waits several hundred nanoseconds before the pulse starts to curve upwards again. This is due to the relatively small Einstein coefficient C~10 19 J" 1 cm 3 sec" 2 ) for the 2V 3 to V ?5 transition.…”

Section: Chapter IV Modelmentioning

confidence: 99%

“…The two types of terms are those for radiative 52 and collisional transitions. The collisional rates are given in figure 19 and diluent collision rates j 1*5 ,1+g…”

Section: Chapter IV Modelmentioning

confidence: 99%

“…For infrared lasers, this corresponds to molecular vibrational frequencies, and it was soon discovered that the laser could play an important role in the study of a process mediated through vibrations such as chemical reaction. [16][17][18][19][20][21][22][23] Lasers have become an important tool in fluorescence studies, ultra high resolution spectroscopy, and molecular energy transfer, as well as developing passive mode lockers for other lasers. 2 " Figure 11 shows a typical experimental set-up for a quasi-CW fluorescence experiment.…”

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Computer simulation of an optically pumped methyl fluoride laser / by Harvey Charles Schau III.

Schau¹

1975

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Molecular beam masers

Lainé

1970

Rep. Prog. Phys.

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The purpose of this article is to review some of the developments and achievements of molecular beam masers from the time of their conception to the present and to delineate areas of particular interest and activity.A discussion of the early history of molecular beam masers is followed by an outline of the general principles and methods of preparation and use of emissive molecular beams. I n particular, electrostatic methods of state selection of molecules and maser cavity resonators are discussed in some detail.An outline of the theory of molecular beam masers is then presented with reference to a number of specific problem areas. The technique of beam maser spectroscopy is discussed with emphasis on spectral resolution and problems of sensitivity. Molecules studied by beam maser spectroscopy are tabulated and discussed. The noise, gain-bandwidth and saturation characteristics of beam maser amplifiers are reviewed. The properties of beam maser oscillators are outlined, which include oscillation conditions, noise, amplitude and frequency characteristics and transient behaviour.The paper concludes with a brief discussion of future trends.

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Investigation of the Gas Laser

Cited by 3 publications

References 14 publications

Energy Distribution Among Reaction Products. IV. X+HY (X ≡ Cl, Br; Y ≡ Br, I), Cl+DI

Energy Distribution Among Reaction Products. IV. X+HY (X ≡ Cl, Br; Y ≡ Br, I), Cl+DI

Computer simulation of an optically pumped methyl fluoride laser / by Harvey Charles Schau III.

Molecular beam masers

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