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Journal of Central China Normal University

Mixing and quenching of Cs(6P_J) states induced by collisions with He atoms and N_2 molecules

Liping Cao

Published Jan 1, 2008• 0 citations
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Abstract

The collisional energy transfer process Cs(6P3/2)+M,where M=He,N2 under gas cell conditions has been investigated.The direct 6P3/2→6S1/2 fluorescence and the sensitized 6P1/2→6S1/2 fluorescence as a function of quenching gas pressure had been measured.For quenching by He where only electronic to translational energy transfer is possible.However,in the N2 case,electronics to vibrational or rotational transfer is important.Using a two-state rate equation model the transfer rate coefficients from Cs(6PJ) had been obtained.

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Shuying Wang, Maozhu Sun, Kang Dai +1 more

The collisional energy transfer process Cs(6P(3/2)) + M, where M = Ne, N2, under gas cell conditions has been investigated. The Cs(6P(3/2)) state was excited by a diode laser. The direct 6P(3/2) --> 6S(1/2) fluorescence and the sensitized 6P(1/-2) --> 6S(1/2) fluorescence as a function of quenching gas pressure were measured. For quenching by Ne only energy transfer from the electronic to translational is possible. However, in the N2 case, energy transfer from the electronic to vibrational or rotational is important. Using a two-state rate equation model, the quenching rate coefficients for Cs(6P(3/2)) were obtained. The fine structure energy transfer rate coefficient for Ne is 1.45 x 10(-12) cm3 x s(-1). By comparing the relative fluorescence intensities for Ne and N2 case, the authors estimate that the rate coefficient for 6P(3/2) --> 6P(1/2) transfer in collision with N2 is 1.64 x 10(-2) cm3 x s(-1). The quenching rate coefficient for the 6P state is 4. 88 x 10(-12) cm3 x s(-1).

•Jun 1, 2007•0 citations

[Mixing and quenching of Rb 5PJ states induced by collisions with He atoms and N2 molecules].

Fanxin Meng, Qin Chen, Kang Dai +1 more

The collisional energy transfer process Rb(5PJ)+M, where M= He, N2, under gas cell conditions has been investigated. The Rb(5P3/2) state was excited by a diode laser. The direct 5P3/2-->5S1/2 fluorescence and the sensitized 5P1/2-->5S1/2 fluorescence as a function of quenching gas pressure were measured. The 5P3/2 and 5P1/2 states are separated by 238 cm(-1). The closest other states are >6500 cm(-1) or >28 KT. Neglect of these other states should be an excellent approximation. In the experiment the Rb density was 4.5 x 10(11) cm(-3). Using radiation trapping theory the effective radiative rate=Gammae5P3/2-->5S1/2 2.47 x 10(7) s(-1) was obtained. For quenching by He only electronic to translational energy transfer is possible. However, in the N2 case, electronic to vibrational or rotational transfer is important. The Rb(5P3/2) state is 13 cm(-1) lower than the N2[X'Sigmag+ (V= 5, J= 11)]state; this energy gap is near resonant. The authors have not attempted to directly observe this possible E-R quenching channel Using a two-state rate equation model the transfer rate coefficients from Rb(5PJ) were obtained. The rate coefficient (k21He) for 5P3/2-->5P1/2 transfer in collision with He is 2.61 x 10(-12) cm3 x s(-1). By comparing the direct and sensitized fluorescence intensities for He and N2 case, and fitting the experimental results to the rate equation analysis, the authors estimate that the rate coefficient (k21N2) for 5P3/2-5P1/2 transfer in collision with N2 is 2.36 x 10(-11) cm3 x s(-1). The E-V quenching rate coefficient (kN2) of the 5PJ state is 1.44 x 10(-10) cm3 x s(-1). The authors found find that the rate coefficient kN2 is about 6 times larger than the k21N2. The assumption that the Cs-N2 energy transfer occurs primarily in collinear collision geometry is supported. The results are discussed in relation to those of other experiments.

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Excitation energy transfer of the Rb 5P_J states induced by collisions with Ne atoms and N_2 molecules

YA Senjan

The collisional energy transfer process Rb(5PJ) +M,where M=Ne,N2 under gas cell conditions has been investigated.The Rb(5P3/2) state was excited by a diode laser.The direct 5P3/2→5S1/2 fluorescence and the sensitized 5P1/2→5S1/2 fluorescence as a function of quenching gas pressure had been measured.For collision with Ne where only electronic to translational energy transfer is possible.However,in the N2 case,electronics to vibrational or rotational transfer is important.Using a two-state rate equation model the transfer rate coefficients from Rb(5PJ) had been obtained.The rate coefficient for 5P3/2→5P1/2 transfer in collision with Ne is 1.53×10-12 cm3s-1.By comparing the relative fluorescence intensities for Ne and N2 case,and fitting the experimental results to the rate equation analysis,we estimate that the rate coefficient for 5P3/2→5P1/2 transfer in collision with N2 is 1.05×10-10cm3s-1.The quenching rate coefficient out of the 5PJ state is 1.12×10-10 cm3s-1.The results are discussed in relation to those of other experiments.

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Journal of Atomic and Molecular Physics•Jan 1, 2007•0 citations

Radiation and Collision Energy Transfer of Excitated Cs(6P) Atoms Mixed with He

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Chinese Journal of Lasers•Jan 1, 2007•0 citations

Rb(5P_J)+(Ne, N_2) collisional energy transfer

Qing Wang

The collisional energy transfer in Rb(5P_J)+M collisions,where M=Ne,N_2 under gas cell conditions was investigated.For collision with Ne only electronic to translational energy transfer is possible.However,in the N_2 case,electronics to vibrational or rotational transfer is important.The Rb(5P_(3/2))state is excited by a tunable CW diode laser,where the laser is tuned slightly off resonance.The ratio of 5P_(1/2)→5S_(1/2)to the 5P_(3/2)→5S_(1/2) fluorescence as a function of quenching gas pressure was measured.Using a two-state rate equation model the transfer rate coefficients from the Rb(5P_J)state was obtained.The rate coefficient for 5P_(3/2)→5P_(1/2) transfer in collision with Ne is 1.53×10~(-12)cm~3s~(-1).Using the ratio of the 5P_(1/2) to 5P_(3/2) fluorescence for Ne and N_2 case,and fitting the experimental results to the rate equation analysis,we estimate that the rate coefficient for 5P_(3/2)→5P_(1/2) transfer in collision with N_2 is 8.83×10~(-11) cm~3s~(-1).The quenching rate coefficient of the 5P_J state is 1.25×10~(-10) cm~3s~(-1).A qualitative explanation for the results was given.

Chinese Journal of Quantum Electronics•Jan 1, 2007•0 citations
The collisional energy transfer process Cs(6P3/2)+M,where M=He,N2 under gas cell conditions has been investigated.The direct 6P3/2→6S1/2 fluorescence and the sensitized 6P1/2→6S1/2 fluorescence as a function of quenching gas pressure had been measured.For quenching by He where only electronic to translational energy transfer is possible.However,in the N2 case,electronics to vibrational or rotational transfer is important.Using a two-state rate equation model the transfer rate coefficients from Cs(6PJ) had been obtained.
The collisional energy transfer process Cs(6P(3/2)) + M, where M = Ne, N2, under gas cell conditions has been investigated. The Cs(6P(3/2)) state was excited by a diode laser. The direct 6P(3/2) --> 6S(1/2) fluorescence and the sensitized 6P(1/-2) --> 6S(1/2) fluorescence as a function of quenching gas pressure were measured. For quenching by Ne only energy transfer from the electronic to translational is possible. However, in the N2 case, energy transfer from the electronic to vibrational or rotational is important. Using a two-state rate equation model, the quenching rate coefficients for Cs(6P(3/2)) were obtained. The fine structure energy transfer rate coefficient for Ne is 1.45 x 10(-12) cm3 x s(-1). By comparing the relative fluorescence intensities for Ne and N2 case, the authors estimate that the rate coefficient for 6P(3/2) --> 6P(1/2) transfer in collision with N2 is 1.64 x 10(-2) cm3 x s(-1). The quenching rate coefficient for the 6P state is 4. 88 x 10(-12) cm3 x s(-1).
The collisional energy transfer process Rb(5PJ)+M, where M= He, N2, under gas cell conditions has been investigated. The Rb(5P3/2) state was excited by a diode laser. The direct 5P3/2-->5S1/2 fluorescence and the sensitized 5P1/2-->5S1/2 fluorescence as a function of quenching gas pressure were measured. The 5P3/2 and 5P1/2 states are separated by 238 cm(-1). The closest other states are >6500 cm(-1) or >28 KT. Neglect of these other states should be an excellent approximation. In the experiment the Rb density was 4.5 x 10(11) cm(-3). Using radiation trapping theory the effective radiative rate=Gammae5P3/2-->5S1/2 2.47 x 10(7) s(-1) was obtained. For quenching by He only electronic to translational energy transfer is possible. However, in the N2 case, electronic to vibrational or rotational transfer is important. The Rb(5P3/2) state is 13 cm(-1) lower than the N2[X'Sigmag+ (V= 5, J= 11)]state; this energy gap is near resonant. The authors have not attempted to directly observe this possible E-R quenching channel Using a two-state rate equation model the transfer rate coefficients from Rb(5PJ) were obtained. The rate coefficient (k21He) for 5P3/2-->5P1/2 transfer in collision with He is 2.61 x 10(-12) cm3 x s(-1). By comparing the direct and sensitized fluorescence intensities for He and N2 case, and fitting the experimental results to the rate equation analysis, the authors estimate that the rate coefficient (k21N2) for 5P3/2-5P1/2 transfer in collision with N2 is 2.36 x 10(-11) cm3 x s(-1). The E-V quenching rate coefficient (kN2) of the 5PJ state is 1.44 x 10(-10) cm3 x s(-1). The authors found find that the rate coefficient kN2 is about 6 times larger than the k21N2. The assumption that the Cs-N2 energy transfer occurs primarily in collinear collision geometry is supported. The results are discussed in relation to those of other experiments.
The collisional energy transfer process Rb(5PJ) +M,where M=Ne,N2 under gas cell conditions has been investigated.The Rb(5P3/2) state was excited by a diode laser.The direct 5P3/2→5S1/2 fluorescence and the sensitized 5P1/2→5S1/2 fluorescence as a function of quenching gas pressure had been measured.For collision with Ne where only electronic to translational energy transfer is possible.However,in the N2 case,electronics to vibrational or rotational transfer is important.Using a two-state rate equation model the transfer rate coefficients from Rb(5PJ) had been obtained.The rate coefficient for 5P3/2→5P1/2 transfer in collision with Ne is 1.53×10-12 cm3s-1.By comparing the relative fluorescence intensities for Ne and N2 case,and fitting the experimental results to the rate equation analysis,we estimate that the rate coefficient for 5P3/2→5P1/2 transfer in collision with N2 is 1.05×10-10cm3s-1.The quenching rate coefficient out of the 5PJ state is 1.12×10-10 cm3s-1.The results are discussed in relation to those of other experiments.
The collisional energy transfer process Rb(5PJ)+M,where M=He,N2 under gas cell conditions has been investigated.The Rb(5P3/2) state was excited by a diode laser,the laser is tuned slightly off resonance.The direct 5P3/2→5S1/2 fluorescence and the sensitized 5P1/2→5S1/2 fluorescence as a function of quenching gas pressure had been measured.For collision with He where only electronic to translational energy transfer is possible.However,in the N2 case,electronics to vibrational or rotational transfer is important.Using a two-state rate equation model the transfer rate coefficients from Rb(5PJ) had been obtained.The rate coefficient for 5P3/2→5P1/2 transfer in collision with He is 2.23×10-12 cm3 s-1.By comparing the relative fluorescence intensities for He and N2 case,and fitting the experimental results to the rate equation analysis,we estimate that the rate coefficient for 5P3/2→5P1/2 transfer in collision with N2 is 4.38×10-11 cm3 s-1.The quenching rate coefficient out of the 5PJ state is 5.45×10-11 cm3 s-1.The results are discussed in relation to those of other experiments.
By applying the laser absorption and fluorescence method,the cross sections for the fine structure mixing and quenching of the Cs(6P) state,induced by collision with He atoms,have been measured.Cesium atoms were optically excited to the 6P3/2 state.The excited atom density and spatial distribution were mapped by monitoring the absorption of a counterpropagating single mode laser beam,which was tuned to the 6PJ→8S1/2 transitions.The effective radiative rates were calculated for the 6PJ→6S transitions.The fluorescence intensity I895 of the sensitized 6P1/2→6S1/2 emission was measured as a function of He density in the range 0.5×1018～4×1018cm-3 at constant temperature T=337 K.It was found that the quantity N/I895 exhibited a parabolic dependence on N,confirming that the quenching of the 6PJ states was due to collision with He atoms,not ground state Cs atoms.The coefficients of the second-order polynomial fitted through the measured data yielded the cross sections σ3/2→1/2=(1.46±0.51)×10-19 cm2 and σD=(2.28±0.80)×10-18 cm2 for the 6PJ fine structure mixing and quenching,respectively,due to collision with He atoms.
The collisional energy transfer in Rb(5P_J)+M collisions,where M=Ne,N_2 under gas cell conditions was investigated.For collision with Ne only electronic to translational energy transfer is possible.However,in the N_2 case,electronics to vibrational or rotational transfer is important.The Rb(5P_(3/2))state is excited by a tunable CW diode laser,where the laser is tuned slightly off resonance.The ratio of 5P_(1/2)→5S_(1/2)to the 5P_(3/2)→5S_(1/2) fluorescence as a function of quenching gas pressure was measured.Using a two-state rate equation model the transfer rate coefficients from the Rb(5P_J)state was obtained.The rate coefficient for 5P_(3/2)→5P_(1/2) transfer in collision with Ne is 1.53×10~(-12)cm~3s~(-1).Using the ratio of the 5P_(1/2) to 5P_(3/2) fluorescence for Ne and N_2 case,and fitting the experimental results to the rate equation analysis,we estimate that the rate coefficient for 5P_(3/2)→5P_(1/2) transfer in collision with N_2 is 8.83×10~(-11) cm~3s~(-1).The quenching rate coefficient of the 5P_J state is 1.25×10~(-10) cm~3s~(-1).A qualitative explanation for the results was given.