A novel method of preparing ions in selected rovibronic states is presented. It is based on pulsed field ionization of long-lived high-n Rydberg states lying just below the different rovibronic energy levels of the ion. The potential of the method is illustrated with the example of hydrogen: A clean population of H2 + ions is prepared in the X 2Σg + (v+ = 2, N+ = 0, 1, 2, 3) states. The method ought to be applicable to the preparation of a wide range of small molecular ions in selected rotational states and opens new possibilities in the study of state-to-state ion-molecule reactions. © 1993 American Institute of Physics.
|Number of pages||2|
|Journal||Journal of Chemical Physics|
|Publication status||Published - 1 Dec 1993|