Odd-even harmonic generation from oriented CO and NO molecules within strong-field approximation

Abstract

Recently, the pure-even high-order harmonic generation (HHG) has theoretically found by the ab initio methods for CO molecules interacting with an intense laser. An examination of this phenomenon using the analytical approach such as the Lewenstein model, and for another polar molecular with other symmetry is needed. In this study, we theoretically investigate the odd-even harmonic generation from the CO and NO molecules in the linearly polarized laser field by using the Lewenstein model. Firstly, we confirm entirely the pure-odd and pure-even emission from CO whose molecular axis is perpendicular to the polarization direction of the laser. Secondly, we show that the odd-even behavior of the HHG spectra from NO is similar to that from the CO molecule. The HOMO’s symmetricity of the linear molecule does not change the odd-even property of the HHG spectra.

Tách Phần Chẵn Và Lẻ Của Lưỡng Cực Dịch Chuyển Tức Thời Bằng Lí Thuyết Floquet

“…Besides, DCeP effects on the HHG intensity near the cutoff of the HHG from CO (Le, Hoang, Tran, & Le, 2018;Bin Zhang et al, 2014) và CO 2 (Le, Vu, Ngo, & Le, 2019). Recently, we have also indicated the influence of the DCeP on the correlation between the intensity of the even and odd harmonics in the HHG of CO and NO molecules (Le, & Phan, 2020;Phan, Le, Hoang, & Le, 2019). To interpret this phenomenon, we have calculated the gerade and ungerade components of the temporal transition dipole (Le, & Phan, 2020;Phan et al, 2019).…”

“…Recently, we have also indicated the influence of the DCeP on the correlation between the intensity of the even and odd harmonics in the HHG of CO and NO molecules (Le, & Phan, 2020;Phan, Le, Hoang, & Le, 2019). To interpret this phenomenon, we have calculated the gerade and ungerade components of the temporal transition dipole (Le, & Phan, 2020;Phan et al, 2019). Accordingly, while the odd harmonics are caused by the recombination of electrons into the gerade part, the even harmonics -into the ungerade part of HOMO of CO molecule at the recombination time.…”

“…The authors have explained that the pure odd and pure even HHG spectra based on the gerade and ungerade of the induced dipole acceleration. So the question is that, besides the approach of using temporal transition dipole as in (Le, & Phan, 2020;Phan et al, 2019), is it possible to use induced…”

Three-dimensional tomographic imaging of CO molecular orbitals reveals multi-electron effects

“…MOT was then developed to a more general method [19][20][21][22] and extended to more complex symmetric molecules, such as CO 2 [21,23] and C 2 H 2 [23,24]. In recent years, asymmetric molecular orbital tomography (AMOT) has drawn more attention, such as imaging of HeH 2+ [25][26][27] and CO [28][29][30][31][32][33]. Compared with symmetric molecules, the symmetry breaking of asymmetric molecules makes AMOT more difficult.…”