[10p-C213-1~10] 3.5 Ultrashort-pulse and high-intensity lasers

4:30 PM - 4:45 PM JST(7:30 AM - 7:45 AM UTC)

[10p-C213-10] Orientation of Rotational Angular Momentum in Gas-Phase Molecules Using Circularly Polarized Mid-Infrared Pulses

〇Hiroki Tsusaka¹, Ikki Morhichika¹, Satoshi Ashihara¹ (1.IIS, UTokyo)

Keywords:

mid-infrared,2D spectroscopy,rovibrational

We demonstrate simultaneous multistep rovibrational excitation and orientation of rotational angular momentum in gas-phase CO₂ using circularly polarized mid-infrared pulses. Excitation up to at least (V=3) was confirmed. Polarization-controlled 2D-IR spectroscopy revealed circular dichroism in individual rotational lines, from which the range of the orientation parameter in (V=3) was evaluated. This method enables simultaneous control of vibrational excitation and the direction of rotational angular momentum in electronically ground-state molecules.