Effect of nuclear motion on harmonic cutoff intensity of H2+ and D2+

Abstract:

The intensity of harmonic cutoff region of H2+ and D2+ driven by different laser conditions has been studied theoretically. The results show that for the lower laser intensity case, the harmonic yield of H2+ is higher than that of D2+ when the shorter pulse duration is used. As the pulse duration increases, the harmonic yield of D2+ will be enhanced and higher than that of H2+. For the higher laser intensity case, when the shorter pulse duration is used, the intensity difference of harmonic yield is decreased, though the harmonic yield of H2+ is still higher than that of D2+. When the longer pulse duration is used, the harmonic yield of D2+ is much higher than that of H2+. Theoretical analyses show that the different harmonic yields of H2+ and D2+ is attributed to different time scales of nuclear motion.