Deactivation rate constants and product branching in collisions of the Xe(6<i>p</i>) states with Kr and Ar

Xu, Jiayi; Setser, D. W.

doi:10.1063/1.457777

Cited by 39 publications

(17 citation statements)

References 39 publications

(10 reference statements)

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“…The energy difference between the 6p[1/2] 0 state and the 5s[3/2] 2 (Kr) state is only ∼147 cm –1 . The 6p[1/2] 0 atoms strongly tend to reach the 5s[3/2] 2 (Kr) state . The energy difference between the 5s[3/2] 2 (Kr) state and the 5d[1/2] 1 state is only ∼12 cm –1 .…”

Section: Results and Discussionmentioning

confidence: 99%

“…Setser and co-workers have found that the decay curves for 828 nm (6p[1/2] 0 −6s[3/2] 1 ) in buffer gases of Ar and Ne fit a double exponential decay, while those in Xe, Kr, and He fit a single exponential decay. 9,10,12 To identify this phenomenon, the decay curves for 828 nm (6p[1/2] 0 −6s[3/ 2] 1 ) were measured and fitted in these gases, as shown in Figure 2. Clearly, the decay curves for 828 nm (6p[1/2] 0 − 6s[3/2] 1 ) in Ar and Ne buffer gases both deviate from a single exponential decay function, while those in He and Kr fit a single exponential decay function.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The 6p[1/2] 0 atoms strongly tend to reach the 5s[3/2] 2 (Kr) state. 12 The energy difference between the 5s[3/ 2] 2 (Kr) state and the 5d[1/2] 1 state is only ∼12 cm −1 . The 5s[3/2] 2 (Kr) atoms must have a high probability to reach the 5d[1/2] 1 state.…”

Section: The Journal Of Physical Chemistry Amentioning

confidence: 99%

“…As a result, the kinetic processes among the excited states of Xe are more complex. Many researchers have studied the kinetics between the excited states of Xe. − Only when the kinetic process is definited, the lifetimes and decay rate constants for the excited states of Xe can be accurately deduced. To avoid the risk of triggering unexpected processes, the excitation laser powers used in these studies are relatively low. , However, the laser systems always prefer a high power of pump sources.…”

Section: Introductionmentioning

confidence: 99%

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Energy-Transfer Kinetics for Xe (6p[1/2]₀) Atoms in Kr, Ar, Ne, and He

Liu

et al. 2018

J. Phys. Chem. A

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The kinetic processes for the Xe (6p[1/2]) atoms in Kr, Ar, Ne, and He buffer gases were studied. We found that Kr, Ar, and Ne atoms can be used to switch the amplified spontaneous emission (ASE) channel from 3408 nm (6p[1/2]-6s'[1/2]) to 3680 nm (5d[1/2]-6p[1/2]), while Xe and He atoms do not show such a phenomenon. This ASE channel switch is mainly ascribed to the fast transfer of 6p[1/2] → 5d[1/2]. On the basis of the rate equations for two-state coupling (energy-transfer processes between the two states are very rapid), the reason why the ASE channel switch effect normally coincides with a double exponential decay of the spontaneous emission at 828 nm (6p[1/2]-6s[3/2]) is explained. The actual situations in Xe, Ar, Ne, and He follow this rule. However, the strictly single exponential decay of the spontaneous emission at 828 nm and strong ASE channel switch effect simultaneously emerge in Kr. This indicates that the transfer of 6p[1/2] → 5d[1/2] in Kr does not occur via two-state coupling, but via two steps of near-resonance collision through the 5s[3/2] (Kr) state as the intermediate state (6p[1/2] → 5s[3/2] (Kr) → 5d[1/2]). In addition, we found Xe (6p[1/2]) atoms strongly tend to reach the 6p[3/2], 6p[3/2], and 6p[5/2] states through the 5s[3/2] (Kr) state as the intermediate state in Kr. The 5s[3/2] (Kr) state plays a very important role in the energy-transfer kinetics for the Xe (6p[1/2]) atoms. Kr is probably an excellent buffer gas for laser systems based on Xe.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: The Journal Of Physical Chemistry Amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy-Transfer Kinetics for Xe (6p[1/2]₀) Atoms in Kr, Ar, Ne, and He

Liu

et al. 2018

J. Phys. Chem. A

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“…However, studies based on metastable Xe are relatively rare. Many groups have studied the energy-transfer processes between the high excitation states of Xe. − However, the excitation energies they used are lower than the threshold of the mid-infrared ASE.…”

Section: Introductionmentioning

confidence: 99%

Energy-Transfer Kinetics Driven by Midinfrared Amplified Spontaneous Emission after Two-Photon Excitation from Xe (s₀) to the Xe (6p[1/2]₀) State

Guan

Liu

et al. 2017

J. Phys. Chem. A

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In optically pumped laser systems, rare gas lasers (RGLs) are a field of great interest for researchers. Gas laser regimes with metastable Ne, Ar, and Kr atoms have been investigated, while studies of RGLs based on metastable Xe are sparse. In this work, when a strong excitation laser (2.92 mJ/pulse, 7.44 × 10 W/cm) was applied to excite Xe atoms from the ground state to the 6p[1/2] state, an interesting phenomenon emerged: An intense fluorescence of 980 nm (6p[1/2]-6s[3/2]) was produced. However, when the energy of excitation laser was decreased to 0.50 mJ/pulse (1.27 × 10 W/cm), the fluorescence of 980 nm became very weak. Besides, lifetime and decay rate constant of the 6p[1/2] state under the condition of E = 2.92 mJ are significantly different from either those measured by other groups or those of E = 0.50 mJ. These phenomena indicate that the high energy of excitation laser should trigger some new kinetic mechanisms. Further works identified that the new kinetic mechanism is the MIR ASE of 3408 nm (6p[1/2]-6s'[1/2]). The mechanisms are proposed as follows. Substantial 6p[1/2] atoms are produced by laser excitation. Then, the ASE of 3408 nm (6p[1/2]-6s'[1/2]) is quickly produced to populate substantial 6s'[1/2] atoms. The 6s'[1/2] atoms can readily arrive at the 6p[1/2] states through collision by virtue of the small energy difference (84 cm) and high collision rate constant of the transition from the 6s'[1/2] state to the 6p[1/2] state. As a result, the intense fluorescence of 980 nm is generated.

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