Quantum interference of multi-orbital effects in high-harmonic spectra from aligned carbon dioxide and nitrous oxide

doi:10.1088/1674-1056/ab3438

Abstract

We investigate experimentally multi-orbital effects in high-order harmonic generation (HHG) from aligned CO₂ and N₂O molecules by intense femtosecond laser fields with linear and elliptical polarizations. For either of the aligned molecules, a minimum in the harmonic spectrum is observed, the position of which shifts to lower-order harmonics when decreasing the intensity or increasing the ellipticity of the driving laser. This indicates that the minimum originates from the dynamic interference of different channels, of which the tunneling ionization and recombination are contributed via different molecular orbitals. The results show that both the highest occupied molecular orbital (HOMO) and low-lying HOMO-2 in CO₂ (or HOMO-1 in N₂O) contribute to the molecular HHG in both linearly and elliptically polarized strong laser fields. Our study would pave a way for understanding multi-electron dynamics from polyatomic molecules irradiated by strong laser fields.

Keywords: high-order harmonic generation aligned molecule multi-orbital effect dynamic interference

Received: 27 May 2019
Revised: 24 June 2019
Accepted manuscript online:

PACS:	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	33.80.-b	(Photon interactions with molecules)
	33.80.Rv	(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 91750104, 11534004, 11874179, 11127403, 11474130) and the Natural Science Foundation of Jilin Province, China (Grant No. 20180101289JC).

Corresponding Authors: Ri Ma, Hai-Feng Xu
E-mail: rma@jlu.edu.cn;xuhf@jlu.edu.cn

Cite this article:

Hong-Jing Liang(梁红静), Xin Fan(范鑫), Shuang Feng(冯爽), Li-Yu Shan(单立宇), Qing-Hua Gao(高庆华), Bo Yan(闫博), Ri Ma(马日), Hai-Feng Xu(徐海峰) Quantum interference of multi-orbital effects in high-harmonic spectra from aligned carbon dioxide and nitrous oxide 2019 Chin. Phys. B 28 094207

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Quantum interference of multi-orbital effects in high-harmonic spectra from aligned carbon dioxide and nitrous oxide

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