Quenching of krypton atoms in the metastable 5s (³P₂) state in collisions with krypton and helium atoms

Quenching of Metastable 5 s′(3P0) Krypton Atoms in Collisions with Krypton and Argon Atoms in High-Pressure Laser Mixtures

“…It follows from (7), (8) and predictable time behavior [Kr * (t) (6)] that the trailing edge of the ln(1/T (t)) pulse is expected to be just exponential…”

“…These experiments are a part of our long-term research on quenching the lower atomic s-states of neon, krypton, and xenon rare gases in high-pressure (p > 1 atm) binary mixtures with a large amount of lighter rare gas, acting as a buffer gas (see reviews [3,4] and references therein and more recent publications [5][6][7]). …”

“…The rate constants here are obtained by the absorption probe technique [1][2][3][4][5][6][7], by monitoring the decay time of the state under study as a function of pressure and component ratio of the working and buffer gases. Finally, time-resolved absorption is measured in the afterglow of a high-power e-beam pulse using a probing light pulse at wavelength λ = 0.7855 μm, corresponding to a high-oscillator-strength optical The experiments were carried out with the coldcathode electron gun of the Tandem pulsed laser system described in [12].…”

On the possibility of developing quasi-CW high-power high-pressure laser on 4p–4s transition of ArI with electron beam—optical pumping: quenching of 4s (3P2) lower laser level

“…A set of experimental data for the mixtures He-Ar = 50:1, 75:1, 100:1 and 200:1 at gas pressures from p = 1.75 to 4.0 atm was numerically calculated with a step of 0.25 atm. In the coordinates of figure 5a the function (12) corresponds to the function ln(1/T) = p ex exp(-k ex (t-t 0 )) + p d exp(-(γg (t-t 0 )) 2 ) exp(-γk d (t-t 0 )), (13) where the first, slowly-decaying term of the right-hand side of (13) p ex exp(-k ex (t-t 0 )) (14) describes a broadband absorption (γ = 1) of the probe pulse by the excimer molecules, whereas the second term p d exp(-(γg (t-t 0 )) 2 ) exp(-γk d (t-t 0 )) (15) describes the studied exponential process of collisional quenching of o 2 4s[3/2] metastable state exp(-γk d (t-t 0 )) (16) with "Gaussian pre-exponent" exp(-(γg (t-t 0 )) 2 ), (17) which provides a correction for the recombination and relaxation processes of populating this state [11,12]. Obtaining a true form of the Gaussian pre-exponent in analytical form is hardly possible because of the variety and complexity of the relevant reactions depending, in particular, on the time-varying temperature and density of the secondary electrons.…”

“…having the smallest deviation, in terms of the procedure, from the set of the experimental points (see [13] for details). Processing of the experimental dependences lnln[1/T(t)] within the above-described technique but using a simpler linear approximation (the bold line A in figure 5b, see also [14]) allowed us to estimate the reaction rate constants with rather limited accuracy, which estimate makes it possible to find an "upper bound" for the rate constants ( Table 1).…”