Comparison of Hf and Df Continuous Chemical Lasers: Ii. Spectroscopy

Kwok, Munson A.; Giedt, R. R.; Gross, Rolf W. F.

doi:10.1063/1.1653036

Cited by 33 publications

(5 citation statements)

References 3 publications

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“…There is evidence of "cascading" (i.e., the Pz (5) This has been done [7], and some of the performance characteristics have been obtained. Spectroscopic observations [8 ] are given in fig. 7.…”

Section: Resultsmentioning

confidence: 99%

“…1). In subsequent tests [7][8][9] a multiple nozzle grid was used ( fig. 2) to reduce 156 lateral diffusion distances.…”

Section: Facility Descriptionmentioning

confidence: 99%

“…Inversion was achieved by the diffusion of H2 into a supersonic free-jet containing F atoms. Since then, certain performance aspects of this laser have been under experimental study [6][7][8]. Major results are summarised herein.…”

Section: Introductionmentioning

confidence: 97%

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Initial performance of a CW chemical laser

1970

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The performance of a continuous HF chemical laser is presented in this paper. Population inversion was obtained by diffusion of H2 into a supersonic jet containing F atoms [H2 + F-* HF(v) + H, AH = -31.7 kcal/mole]. A peak power of 630 W was obtained with an F atom flow rate of 0.040 mole/sec, and the efficiency of conversion of chemical energy to laser energy was 12%. The performance of a corresponding DF laser is also given. Major laser output is from 2-1 and 1-0 transitions for both lasers. Radiation is at 2.6 to 2.9/~m and 3.6 to 4.0/zm for the HF and DF lasers, respectively. The ratio of DF to HF laser power is 0.7 under similar flow conditions.

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Section: Resultsmentioning

confidence: 99%

“…1). In subsequent tests [7][8][9] a multiple nozzle grid was used ( fig. 2) to reduce 156 lateral diffusion distances.…”

Section: Facility Descriptionmentioning

confidence: 99%

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Initial performance of a CW chemical laser

1970

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“…Although less power was extracted from the D F medium, more lines were observed to oscillate presumably since the energy levels are more closely spaced in D F than in HF. Oscillation was observed from the u = 3+u = 2 levels on P(4), P(5), P(6), and P (7) the u = 2 + u = 1-levels on P(5), P(6), and P(7) rotational transitions [22]. Both the H F and D F lasers demonstrate similar laser power output versus current characteristics exhibiting a distinct maximum.…”

Section: )mentioning

confidence: 92%

“…In both cases the laser was operated in the lowest order Gaussian mode. In HF, laser oscillation was obtained from the u = 2-u = 1 vibrational levels on P(7), P(8), and P(9) transitions from the u= 1 +u = 0 vibrational levels on P(8) and P(9) transitions [22]. The u = 1 + u = 0 transitions were considerably weaker and oscillated only when the laser parameters were adjusted for maximum power.…”

Section: )mentioning

confidence: 99%

Magnetic stabilization of the plasma column in flowing molecular lasers

Buczek¹,

Freiberg²,

Chenausky³

et al. 1971

Proc. IEEE

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A technique of magnetically stabilizing the position of the plasma column and the resulting inversion region in lower pressure flowing molecular lasers is described.A transverse magnetic field, mutually perpendicular to the discharge axial electric field and the gas flow velocity, is employed to maintain the electrical discharge column parallel with the optic axis. The magnetic stabilization of the discharge is analyzed in terms of the Lorantz forces and the resulting ambipolar drifts of the plasma. A comparison with magnetically stabilized arcs is presented. Supporting experimental data obtained for pure gases and typical laser gas mixtures are given. The operating characteristics of the cross-field CO, laser which employs a premixed gas flow channeled transvarse to the stabilized discharge t o provide convective gas cooling are discussed. The experimental results of a parametric study on the dependence of gain and power output upon gas flow velocities, magnetic field, gas mixtures, and pressure are presented. The operation of the first premixed CW electrically initiated chemical laser has been achieved using cross-field magnetic discharge stabilization. Preliminary operating characteristics of this chemical laser for the 3-p rotational-vibrational transitions in HF and the 4-p transitions in DF are presented.

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Potential Practical Applications of Basic Research in Molecular Dynamics

Bernstein

1971

Israel Journal of Chemistry

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The chemical technology of the future will require a deeper knowledge of fundamental molecular‐dynamical processes. It will no longer suffice to be able to systematize (and even calculate) static properties of simple molecules in equilibrium or to produce tables of Arrhenius kinetic parameters characterizing the rate constants of a host of elementary chemical reactions. In order to make significant gains, in the sense of “breakthrough technology”, an intimate knowledge of basic molecular dynamical behavior will be needed. Such insight is derivable from a new class of experiments at the atomic and molecular level and from new theoretical‐computational approaches to molecular‐dynamical problems. To illustrate these new requirements, and the potential practical applications of an improved understanding at the basic level, examples are presented in the areas of combustion and atmospheric pollution, atmospheric and ionospheric chemistry, synthetic applications of selective excitation, lasers in chemistry and chemical‐to‐radiation energy conversion.

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Comparison of Hf and Df Continuous Chemical Lasers: Ii. Spectroscopy

Abstract: Continuous laser action has been observed on several HF and DF vibrational-rotational transitions. The HF lases between 2.6 and 2.9μ and DF lases between 3.6 and 4.1μ. The lines are identified and the relative intensities are shown.

Cited by 33 publications

References 3 publications

Initial performance of a CW chemical laser

Initial performance of a CW chemical laser

Magnetic stabilization of the plasma column in flowing molecular lasers

Potential Practical Applications of Basic Research in Molecular Dynamics

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