CAJ | 학술논문

利用受激拉曼泵浦将H2激发到v＝1， J＝3态，研究了H2（1，3）态与Cs2分子碰撞（1，3）态的弛豫及Cs2（X1∑g＋）振动态的激发过程.利用相干反斯托克斯拉曼散射（CARS）检测H2的振转态分布，由CARS峰值得到密度比[H2（1，3）]／[H2（0，3）]和[H2（1，1）]／[H2（1，3）]，由H2（ν＝0）振转态的Boltzmann分布确定H2（0，3）的密度，由此得到[H2（1，3）]和[H2（1，1）]态的密度.激光诱导荧光光谱（LIF）确定被碰撞激发的Cs2（X1∑g＋，ν″＝11－15）各态.利用单模半导体激光作瞬时光吸收，对于ν″＝11，12，13，14和15，积分吸收系数（单位：106 cm－1 s－1）分别是6.5，7.9，7.0，6.1和4.7，结合H2（1，3）的密度，得到H2（1，3－Cs2（X1∑g＋，ν″）的转移速率系数，对于ν″＝11－15，分别是（单位：10－13 cm3 s－1）1.4±0.6，1.7±0.7，1.5±0.6，1.3±0.5和1.0±0.4.利用吸收线Doppler增宽测量分别得到了Cs2（X1∑g＋，ν″＝11－15）的平动能。
이용수격랍만빙포장H2격발도v＝1， J＝3태，연구료H2（1，3）태여Cs2분자팽당（1，3）태적이예급Cs2（X1∑g＋）진동태적격발과정.이용상간반사탁극사랍만산사（CARS）검측H2적진전태분포，유CARS봉치득도밀도비[H2（1，3）]／[H2（0，3）]화[H2（1，1）]／[H2（1，3）]，유H2（ν＝0）진전태적Boltzmann분포학정H2（0，3）적밀도，유차득도[H2（1，3）]화[H2（1，1）]태적밀도.격광유도형광광보（LIF）학정피팽당격발적Cs2（X1∑g＋，ν″＝11－15）각태.이용단모반도체격광작순시광흡수，대우ν″＝11，12，13，14화15，적분흡수계수（단위：106 cm－1 s－1）분별시6.5，7.9，7.0，6.1화4.7，결합H2（1，3）적밀도，득도H2（1，3－Cs2（X1∑g＋，ν″）적전이속솔계수，대우ν″＝11－15，분별시（단위：10－13 cm3 s－1）1.4±0.6，1.7±0.7，1.5±0.6，1.3±0.5화1.0±0.4.이용흡수선Doppler증관측량분별득도료Cs2（X1∑g＋，ν″＝11－15）적평동능。
The relaxation of H2 (1, 3) by collision with Cs2 molecules has been investigated at T=490K.Parti-cular focus is placed on understanding both the dynamical features and the kinetics of collision which are accom-panied by energy transfer into the Cs2 vibrational and translational degrees of freedom, H2 (1, 3) was prepared by stimulated Raman pumping.We have used the CARS ( Coherent anti -stokes Raman Scattering ) spectral technique to probe the internal state distribution of H2 molecules.From CARS spectral peaks population rations [H2(1, 3)] /[H2(0, 3)], [H2(1, 1)] /[H2(1, 3)] are obtained.From rotational Boltzmann distribu-tion ofν=0, these ratios indicate that [H2(1, 3)]=7.8 ×1015cm-3and [H2(1, 1)] =2.2 ×1015cm-3.LIF ( Laser induce fluoresc ence) has been used to detect collisionally excited Cs2 ( X1∑g+,ν″).The densities of the Cs2 ( X1∑g+, ν″) were obtained by monitoring the transient absorption of the single-mode diode laser beam, turned to the B X transitions.Combining with density of the H2(1, 3), the rate coefficients for H2(1, 3)-Cs2 ( X1∑g+,ν″) processes have been determined.Forν″=11, 12, 13, 14 and 15, they are (1.4 ±0.6) ×10 -13 cm3 s-1 , (1.7 ±0.7) ×10 -13 cm3 s-1 , (1.5 ±0.6) ×10 -13 cm3 s-1 , (1.3 ±0.5) ×10 -13 cm3 s -1 and (1.0 ±0.4) ×10 -13 cm3 s-1 respectively.Doppler spectroscopy was used to measure the distribution of Cs2 recoil velocitiesfor individual vibrational levels of the X1Σ+ g state.