Controllable generation of highly stripped ions with different charges by nanosecond laser ionization of clusters at different wavelengths

摘要

We report an effective method to selectively produce highly charged ions by photoionization of cluster beams using commercial nanosecond Nd:yttrium-aluminum-garnet lasers at different wavelengths. He-like ions of C~(4+), N~(5+), O~(6+), S~(6+) and highly charged Xe~(q+) (q～19) ions are produced when cluster beams of benzene, ammonia, acetone, hydrogen sulfide, and xenon are irradiated, respectively, by 1064 nm laser with intensity of ～10~(11) W/cm~2. While the cluster beams are irradiated by 532 nm laser of similar intensity, the ions of the highest charge state switch to C~(3+), N~(3+), O~(3+), S~(4+) and Xe~(11+), respectively.