共振电离光谱(RIs)是在气相中使所选择的一定量子的化学种属的原子通过吸收精密调谐的激光光子而转变成离子对的光致电离方法。由于RIS过程能够被饱和,而且由于容易检测单个电子,因而有可能用它来检测单介原子。这种检测可以通过控制所需激光脉冲的计时以一种时间一分辨的方式来进行。在这个过程中所用的激光,可以调谐到自由原子的不连续 Resonance Ionization Spectroscopy (RIs) is a photoionization method that converts atoms of a selected quantum chemical species in the gas phase to ion pairs by absorbing a precisely tuned laser photon. Because the RIS process can be saturated, and because it is easy to detect a single electron, it is possible to use it to detect single atoms. This detection can be done in a time-resolved manner by controlling the timing of the desired laser pulses. The laser used in this process can be tuned to the discontinuity of free atoms