naa a22 4500 510767540 CHVBK 20180411083201.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s12043-013-0637-x doi (NATIONALLICENCE)springer-10.1007/s12043-013-0637-x High harmonic generation in H2  +  and HD +  by two-colour femtosecond laser pulses [Elektronische Daten] [FARZANA SHARMIN, SAMIR SAHA, S BHATTACHARYYA] We have theoretically investigated the high harmonic generation (HHG) spectra of H2  +  and HD +  using a time-dependent wave packet approach for the nuclear motion with combined two-colour (1ω L -3ω L ) pulsed lasers for ω L corresponding to wavelengths 1064nm and 800nm. The 1ω L and 3ω L lasers have peak intensities of I 1 0 = 5.0×1013W/cm2 and I 2 0 = 2.0×1014W/cm2, respectively. We have taken the pulse duration of T = 50fs for both the fields, and the molecular initial vibrational level v 0 = 0. We have argued that for these combinations, the harmonic generation due to transitions in the electronic continuum by tunnelling or multiphoton ionization may be neglected and only the electronic transitions within the two lowest electronic states would be important. Thus, the characteristic features of HHG spectra in the two-colour field are determined, in our model, by the nuclear motions on the two lowest field-coupled electronic states between which interelectronic and intraelectronic (due to the intrinsic dipole moments in case of HD + ) radiative transitions can take place. We have studied the role of relative phase (φ) of the two fields on the HHG spectra of the molecular ions. In case of HD + , the effect of nonadiabatic (NA) nonradiative interaction between the two lowest Born-Oppenheimer (BO) electronic states (1sσ g , 2pσ u ) has been taken into account. Our calculations give realistic HHG spectra which are reasonably efficient and extended for both H2  +  and HD +  in the mixed two-colour field without involving the electronic continuum. The use of two-colour (1ω L -3ω L ) field enables us to generate high harmonics beyond that achievable with a single 1ω L or 3ω L field of the corresponding intensity, frequency and pulse time. Indian Academy of Sciences, 2013 High harmonic generation nationallicence H2  +  nationallicence HD +  nationallicence two-colour laser pulses 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 India 81/6(2013-12-01), 995-1007 0304-4289 81:6<995 2013 81 12043 https://doi.org/10.1007/s12043-013-0637-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12043-013-0637-x 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 India 81/6(2013-12-01), 995-1007 0304-4289 81:6<995 2013 81 12043 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer