We have investigated collision vibrational energy transfer in RbCs[l3II(V)] and Ar system.Pump laser excitation of the spin-forbidden band had been used to produce l3II(v = 52,53,54). The probe laser was used to excite l3ll(v) to 53n(v' ). Laser induced fluorescence (LIF) from 53II -> I3 ∑+transit- ion was used to obtain effective lifetimes. From Stern-Volmer plots relaxation rate constants were yielded. For v being 54, 53 and 52 , rate constants are (4.4±0.4), (4.0±0.4)and(3.7±0.4) x 1012cm3m-1, respectively. They are increasing with vibrational quantum number. The time evolutions and relative intensities of the three states v = 54, 53 and 52 by preparing v = 54 were obtained. With the help of the integrating the population equations over all time, the two-quantum relaxation could be studied. Using experimental date rate constants for v = 54 → 53 and v = 54 → 52 are(1.9±0.4) and ((0.28 ±0.06) x 1012cm3m-1, respectively. The single quantum relaxation v = 1, accounts for only about 43 % of the total relaxation out of v = 54. Multiquantum relaxation (△v > 1) was found to be important at high vibrational states.%研究了RbCs(13H)高位振动态与Ar间的振动能量转移.脉冲激光分别激发自旋禁戒跃迁13Ⅱ(v=52,53,54←)11∑+,利用激光感应荧光(LIF)探测13Ⅱ(v)的弛豫过程,由振动态的有效寿命通过Stern-Volmer公式得到(v=52,53,54)的弛豫速率系数分别是(3.7±0.4),(4.0±0.4)和(4.4±0.4)×1012cm3m-1,速率系数随v的增加而增大.激光只激发v=54态,改变检测激光与泵浦激光间的延迟时间,分别测量(v=54,53,52)态的LIF相对强度随时间的演化.从三粒子速率方程组,由积分布居数得到u=54→53和v=54→52转移速率系数分别为(1.9±0.4),(0.28±0.06)×1012cm3m-1,单量子弛豫△v=1占总弛豫速率系数的43多量子弛豫△v＞1在高位振动态弛豫过程中是重要的.
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