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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Low-Temperature Rotational Relaxation of N_2 Studied with Resonance-Enhanced Multiphoton Ionization
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Low-Temperature Rotational Relaxation of N_2 Studied with Resonance-Enhanced Multiphoton Ionization

机译：共振增强多光子电离研究N_2的低温旋转弛豫

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摘要

The rotational relaxation of molecular nitrogen has been investigated down to temperatures of about 5 K with a combination of resonance-enhanced multiphoton ionization and supersonic beam time-of-flight techniques. The average rotational relaxation cross section obtained shows a maximum value of 50-60 A~2 at 20-30 K. For lower temperatures this cross section decreases and reaches a value smaller than 30 A~2 at T approx= 5K. For temperatures above 30 K, the cross section decreases slowly as the temperature grows and converges approximately to the determinations from other non-jet techniques and theoretical estimates available for T > 80 K. The results are compared to previous measurements from other groups using different methods, and general good agreement is found. However, we observe a significant discrepancy with some of the data from electron-beam-induced fluorescence that yield much larger cross sections for temperatures lower than 30 K.
机译：结合共振增强的多光子电离和超音速飞行时间技术，研究了分子氮的旋转弛豫，直至温度降至约5K。所获得的平均旋转弛豫横截面在20-30 K时显示出最大值50-60 A〜2。对于较低的温度，该横截面会减小并在T大约= 5K时达到小于30 A〜2的值。对于高于30 K的温度，横截面随着温度的升高而缓慢减小，并大致收敛于其他非喷射技术的测定结果和适用于T> 80 K的理论估计值。将结果与使用不同方法的其他组的先前测量结果进行比较，并且发现总体良好的协议。但是，我们观察到与电子束诱导的荧光的某些数据存在显着差异，这些数据在温度低于30 K时产生更大的横截面。

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