Programme

P.34 -- Poster, VCTP-46

Date: Tuesday, 5 October 2021

Time: 08:30 - 10:00

Extracting component ratio of HCN-HNC isomers mixing from high-order harmonic generation

Quan-Hao Truong, Ngoc-Loan Phan, Van-Hoang Le

Ho Chi Minh City University of Education, Ho Chi Minh City, Viet Nam

When atoms/molecules are exposed to ultrashort intense laser pulses, the non-linear laser-matter interaction results in high-frequency radiation known as high-order harmonic generation (HHG). Since HHG spectra encode rich information about the target, they are intensively applied to extract the molecular properties [1]. The works [2-4] have shown that HHG spectra emitted from various isomers are completely different, particularly their intensity. These results open a great possibility to determine which isomer in the gas from the measured HHG spectra. On another side, the gaseous state of molecules often exists in the isomer mixing, and the ratio of isomer components is an essential quantity affecting the properties of the gaseous ensemble. This report proposes a method to quantitatively extract the percentage of HCN-HNC isomers in the mixing costume from the measured HHG spectra. First, we theoretically approach the task by simulating HHG spectra from the molecular ensemble with various component ratios by solving the time-dependent Schrödinger equation. Afterward, we consider the simulated HHG as experimental data with an unknown mixing percentage to perform extracting procedure. We expect to find an analytical relation between the total HHG intensity and the isomer component ratio, which can be useful for the retrieval process. Finally, we can examine the reliability of the method by comparing the extracted component ratio and the data initially input to the HHG simulation. REFERENCES [1] J. Itatani, J. Levesque, D. Zeidler, H. Niikura, H. Pepin, J. C. Kieffer, P. B. Corkum, and D. M. Villeneuve, Nature 432, 1 (2004). [2] N.-T. Nguyen, B.-V. Tang, and V.-H. Le, J. Mol. Struct. THEOCHEM 949, 52 (2010). [3] M. C. H. Wong, J.-P. Brichta, M. Spanner, S. Patchkovskii, and V. R. Bhardwaj, Phys. Rev. A 84, 051403 (2011). [4] A.-T. Le, R. R. Lucchese, and C. D. Lin, Phys. Rev. A 88, 021402 (2013).

Presenter: Truong Quan Hao