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用增强型光声池显著降低了光声信号的面损耗,使得AsH3 分子的振动平动能量转移成为造成共振峰展宽的主要因素。光声池内充9.06 kPa的AsH3 气体,声共振品质因子Q高达374。推导了光声信号振幅与入射光调制频率和样品分子振动-平动弛豫时间的函数关系。理论公式与实验数据的对比表明,对振动热容贡献大的振动能级在气体分子的振动平动能量转移过程中起主要作用;波动过程中AsH3 分子通过最低的两个振动能级进行振动平动能量交换。
With the enhanced photoacoustic tank significantly reduces the photoacoustic signal of the surface loss, making the AsH3 molecular vibrational translational energy transfer becomes the main factor for the resonance peak broadening. The photoacoustic cell is filled with AsH3 gas of 9.06 kPa, and the acoustic resonance quality factor Q is as high as 374. The relationship between the photoacoustic signal amplitude and incident light modulation frequency and sample molecular vibration-translational relaxation time is deduced. The comparison between the theoretical formula and experimental data shows that the vibrational energy level that contributes to the vibrational heat capacity plays a major role in the energy transfer of gas molecules. AsH3 molecules vibrate through the lowest two vibrational levels Dynamic energy exchange.