NDLI: High harmonic generation in $\textbf{H}_{{2}}^{{+}} $ and HD$^{ + }$ by intense femtosecond laser pulses: A wave packet approach with nonadiabatic interaction in HD$^{ + }$

Content Provider	Springer Nature Link
Author	SHARMIN, FARZANA SAHA, SAMIR BHATTACHARYYA, S S
Copyright Year	2013
Abstract	We have theoretically investigated the high harmonic generation (HHG) spectra of $\mathrm{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 ×10$^{14}$ and 4.5 ×10$^{14}$ W/cm$^{2}$, wavelengths (λ$_{L}$) of 800 and 1064 nm, and pulse durations (T) of 40 and 50 fs, for initial vibrational levels v $_{0}$ = 0 and 1. 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 $\mathrm{H}_2^+ $ and HD$^{ + }$ for v $_{0}$ = 1 have been observed for higher value of I $_{0}$ or λ$_{L}$. Our calculations indicate reasonable efficiencies of harmonic generation even without involving the electronic continuum.
Starting Page	995
Ending Page	1010
Page Count	16
File Format	PDF
ISSN	03044289
Journal	Pramana
Volume Number	80
Issue Number	6
e-ISSN	09737111
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-04-24
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	High harmonic generation H $_{2}^{+}$ HD$^{ + }$ wave packet nonadiabatic interaction Frequency conversion; harmonic generation, including higher-order harmonic generation Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift Physics Astronomy, Observations and Techniques Astrophysics and Astroparticles
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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