Quantum control of isotope-selective rotational contrast for HO/TO in the gas phase with nonresonant laser pulses

Namba, Tomotaro  ; Kumagai, Yuta   

We extend a simulation framework for isotope-selective rotational control to the water isotopologues HO and TO, and numerically investigate pulse conditions that maximize isotope contrast in an equimolar gas-phase mixture driven by nonresonant, linearly polarized double pulses. We examine characteristic rotational periods associated with transitions from the ground state and find that provides the most effective synchronization for enhancing isotope contrast. To quantify the separation capability, we define a separation factor as the ratio of the three-dimensional alignment of TO and HO. When the pulse delay is synchronized to , a maximum separation factor of 1.99 is obtained at 10K; further optimization increases the separation factor to 2.20. These results demonstrate that appreciable isotope-selective contrast can be achieved even in the HO/TO system.