naa a22 4500 510766757 CHVBK 20180411083159.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s12043-013-0530-7 doi (NATIONALLICENCE)springer-10.1007/s12043-013-0530-7 High harmonic generation in $\textbf{H}_{{2}}^{{+}} $ and HD +  by intense femtosecond laser pulses: A wave packet approach with nonadiabatic interaction in HD +  [Elektronische Daten] [FARZANA SHARMIN, SAMIR SAHA, S BHATTACHARYYA] We have theoretically investigated the high harmonic generation (HHG) spectra of $\textrm{H}_2^+ $ and HD +  using a time-dependent wave packet approach for the nuclear motion with pulsed lasers of peak intensities (I 0) of 3.5 ×1014 and 4.5 ×1014W/cm2, wavelengths (λL) of 800 and 1064nm, and pulse durations (T) of 40 and 50fs, for initial vibrational levels v 0 = 0 and1. We have argued that for these conditions the harmonic generation due to the transitions in the electronic continuum by tunnelling or multiphoton ionization will not be important. Thus, the characteristic features of HHG spectra in our model arise only due to the nuclear motions on the two lowest field-coupled electronic states between which both interelectronic and intraelectronic (due to intrinsic dipole moments, for HD + ) radiative transitions can take place. For HD + , the effect of nonadiabatic (NA) interaction between the two lowest Born-Oppenheimer (BO) electronic states has been taken into account and comparison has been made with the HHG spectra of HD +  obtained in the BO approximation. Even harmonics and a second plateau in the HHG spectra of HD +  with the NA interaction and hyper-Raman lines in the spectra of both $\textrm{H}_2^+ $ and HD +  for v 0 = 1 have been observed for higher value of I 0 or λL. Our calculations indicate reasonable efficiencies of harmonic generation even without involving the electronic continuum. Indian Academy of Sciences, 2013 High harmonic generation nationallicence H $_{2}^{+}$ nationallicence HD +  nationallicence wave packet nationallicence nonadiabatic interaction nationallicence SHARMIN FARZANA Atomic and Molecular Physics Section, Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, 700 032, Kolkata, India aut SAHA SAMIR Atomic and Molecular Physics Section, Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, 700 032, Kolkata, India aut BHATTACHARYYA S. Atomic and Molecular Physics Section, Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, 700 032, Kolkata, India aut Pramana Springer-Verlag 80/6(2013-06-01), 995-1010 0304-4289 80:6<995 2013 80 12043 https://doi.org/10.1007/s12043-013-0530-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12043-013-0530-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- SHARMIN FARZANA Atomic and Molecular Physics Section, Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, 700 032, Kolkata, India aut NATIONALLICENCE 700 1- SAHA SAMIR Atomic and Molecular Physics Section, Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, 700 032, Kolkata, India aut NATIONALLICENCE 700 1- BHATTACHARYYA S. Atomic and Molecular Physics Section, Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, 700 032, Kolkata, India aut NATIONALLICENCE 773 0- Pramana Springer-Verlag 80/6(2013-06-01), 995-1010 0304-4289 80:6<995 2013 80 12043 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer