Effects of a static electric field on two-color photoassociation between different atoms

• Published in: arXiv.org 2014-03
• Main Authors: Chakraborty, Debashree, Bimalendu Deb
• Format: Article
• Language: English
• Subjects: Anisotropy; Color; Coupling (molecular); Dimers; Electric fields; Numerical methods; Rotational spectra; Rotational states; Scattering; Static electricity
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1309.4619

We study non-perturbative effects of a static electric field on two-color photoassociation of different atoms. A static electric field induces anisotropy in scattering between two different atoms and hybridizes field-free rotational states of heteronuclear dimers or polar molecules. In a previous paper [D. Chakraborty \(\it {et.}\) \(\it {al.}\), J. Phys. B 44, 095201 (2011)], the effects of a static electric field on one-color photoassociation between different atoms has been described through field-modified ground-state scattering states, neglecting electric field effects on heteronuclear diatomic bound states. To study the effects of a static electric field on heteronuclear bound states, and the resulting influence on Raman-type two-color photoassociation between different atoms in the presence of a static electric field, we develop a non-perturbative numerical method to calculate static electric field-dressed heteronuclear bound states. We show that the static electric field induced scattering anisotropy as well as hybridization of rotational states strongly influence two-color photoassociation spectra, leading to significant enhancement in PA rate and large shift. In particular, for static electric field strengths of a few hundred kV/cm, two-color PA rate involving high-lying bound states in electronic ground-state increases by several orders of magnitude even in the weak photoassociative coupling regime.