Related papers: Coherent control of molecular rotation in superfluid helium

Coherent control of molecular rotation in superfluid helium

URL: http://arxiv.org/abs/2311.13077v1
Date: Wed, 22 Nov 2023 00:40:18 GMT
Title: Coherent control of molecular rotation in superfluid helium
Authors: Alexander A. Milner, Ian MacPhail-Bartley, Katarina Preocanin, Shroyon Dasgupta, Xuanshan Peng, Valery Milner
Abstract summary: We experimentally demonstrate control of molecular rotation in bulk superfluid $4mathrmHe$. We show that the degree of rotational excitation of $mathrmHe*$ can be enhanced or suppressed by varying the period of the pulse train.
Score: 39.58317527488534
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We experimentally demonstrate control of molecular rotation in bulk superfluid $^4\mathrm{He}$. Metastable helium dimers, $\mathrm{He}_2^*$, are rotationally excited by a periodic train of linearly polarized femtosecond laser pulses. We show that the degree of rotational excitation of $\mathrm{He}_2^*$ can be enhanced or suppressed by varying the period of the pulse train, whereas the directionality of molecular rotation can be controlled by the relative angle between the polarization vectors of pulses in the train. The experimental results are in agreement with numerical calculations, based on a simple model, in which $\mathrm{He}_2^*$ molecules do not interact with the superfluid.

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