Programme

P.75 -- Poster, VCTP-45

Date: Wednesday, 14 October 2020

Time: 08:30 - 10:00

Online presentation

Effect of dynamic core-electron polarization on odd-even high-order harmonic generation from CO molecule

Hien T. Nguyen (1,2,3), Ngoc-Loan Phan (4), Kim-Ngan Nguyen-Huynh (4), Cam-Tu Le (5,6), Van-Hoang Le (4)

(1) University of Science, Ho Chi Minh City, Vietnam (2) Vietnam National University, Ho Chi Minh City, Vietnam (3) Tay Nguyen University, Buon Ma Thuot City, Vietnam 4Atomic Molecular and Optical Physics Research Group, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam 5Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam 6Ho Chi Minh City University of Education, Ho Chi Minh City, Vietnam

Many theoretically and experimentally reports have demonstrated that the high-order harmonic generation (HHG) emitted from asymmetric molecules contains both even and odd orders [1,2]. The emission of even harmonics is attributed to the symmetry breaking of the laser-molecule system [3]. Therefore, the even-to-odd ratio strongly depends on the symmetry-breaking degrees, such as, molecular orientation [4]. In work [5], the authors also indicated that the dynamic core-electron polarization (DCeP) affects the even-to-odd ratio when the molecule interacts with the laser with a specific intensity. However, how does this influence of DCeP for interacting laser with different intensity is still questionable. In this work, we investigate the DCeP effect on the even-to-odd ratio of HHG emitted from CO molecule, when interacting with laser with various parameters. The HHG is calculated by using a numerical method solving the time-dependent Schrödinger equation within the single-active-electron approximation. We show that, when considering the DCeP, with changing the laser intensity, the intensities of the odd and even harmonics are almost comparable. Meanwhile, when the DCeP is neglected, the even-to-odd ratio changes with varying the laser intensity. We then explain these phenomena by considering the separated ungerade and gerade components of the temporal transition dipole. REFERENCES [1] E. Frumker, C. T. Hebeisen, N. Kajumba, J. B. Bertrand, H. J. Worner, M. Spanner, D.M. Villeneuve, A. Naumov, and P. B. Corkum, Phys. Rev. Lett., 2012, 109, 113901. [2] P. M. Kraus, A. Rupenyan, and H. J. Worner, Phys. Rev. Lett., 2012, 109, 233903. [3] R. Silva, P. Rivière, F. Morales, O. Smirnova, M. Ivanov and F. Martín, Sci. Rep., 2016, 6, 32653. [4] S. Yu, W. Li, Y. Li and Y. Chen, Phys. Rev. A, 2017, 96, 013432. [5] Ngoc-Loan Phan, Cam-Tu Le, Van-Hung Hoang and Van-Hoang Le, Phys. Chem. Chem. Phys., 2019, 21, 24177.

Presenter: Nguyen Thi Hien

Presentation file: