New emission lines of methylamine and methyl alcohol molecules in optically pumped lasers

Abstract

The molecular dynamics technique has been used, in conjunction with the interionic potentials of Dagens et al. to study the stability. configuration, binding, and induced migration of mixed dumbbells in an irradiated AI-Zn alloy. For the purpose of comparisons, self-interstitials in pure AI were also investigated. The AI-AI and AI-Zn interactions were described by pair potentials which extended to ninth-neighbour distances. Both the self-interstitial dumbbell and the mixed dumbbell were found to be stable in the (l00) configuration. The formation energy of the self-interstitial is 2.89 eV and the mixed-dumbbell binding energy is 0.38 eV. As a result of this strong binding, the threshold energy required to induce the migration of the mixed dumbbell is about 1.2 eV, which is significantly larger than the minimum energy of about 0.15 eV transferred to a self-interstitial to induce its jumps in pure Al. Caging motions of the mixed dumbbell were observed. The present computer-simulation results are compared with experimental measurements.

On the Assignment of Optically Pumped Far-Infrared Laser Emission from CH3OH

“…In the 9P(36) system, the upper level of the Q (2,4,21) co A pump transition is perturbed upward by about 0.005 cm Ϫ1 by the resonance. However, we determine the coupling matrix element to be only 0.022 cm Ϫ1 , much smaller than the separation of 0.126 cm Ϫ1 between the interacting levels for JЈ ϭ 21, hence there is little state mixing.…”

Far-Infrared Laser Assignments for Methylamine

“…The closure defects δ for three sample combination loops are as follows: The defects are close to zero to within the net estimated uncertainties for the IR and FIR wavenumbers in the loops, supporting the assignments. Combination loops can also be used to obtain the FIRL wavenumber La as follows: The two values are in good agreement with each other and also with the value of 45.714 cm −1 derived from the experimental wavelength of 218.75 μm reported in [7].…”

Far-Infrared Laser Lines from Optically Pumped CH3OH

“…) and Dyubko et al (1981). All reported values are given in the table, but the values of the two works cannot be compared.…”

“…Other papers oGcasiona11y report a different amplitude sequence for FIR emissions from a given pump line, depending on the experimental conditions. The power of FIR lines not included in Petersen et al (1980) and Dyubko et al (1981) is indicated either as S (strong), M (medium), W (weak).…”

“…This is another feature which makes the spectrum more rich and its interpretation more difficult. A typical situation is illustrated in Fig.3 Dyubko et al (1981), who used a (1968) and Kwan and Dennison (1972), they serve as the main basis for the assignments listed in Table IV. The entire assignment procedure, including the role played by polarization measurements, Stark effect measurements, saturated absorption spectroscopy and diode laser spectroscopy has been discussed in details by Henningsen (1982c), where the relevant references can be found.…”