Ground-state properties of Ca₂ from narrow-line two-color photoassociation

authored by

Evgenij Pachomow, Veit Peter Dahlke, Eberhard Tiemann, Fritz Riehle, Uwe Sterr

Abstract

By two-color photoassociation of Ca40 four weakly bound vibrational levels in the Ca2 X1Σg+ ground-state potential were measured, using highly spin-forbidden transitions to intermediate states of the coupled system Π3u and Σ3u+ near the P31+S10 asymptote. From the observed binding energies, including the least bound state, the long-range dispersion coefficients C6,C8,C10 and a precise value for the s-wave scattering length of 308.5(50)a0 were derived. From mass scaling we also calculated the corresponding scattering length for other natural isotopes. From the Autler-Townes splitting of the spectra, the molecular Rabi frequency has been determined as a function of the laser intensity for one bound-bound transition. The observed value for the Rabi frequency is in good agreement with calculated transition moments based on the derived potentials, assuming a dipole moment being independent of internuclear separation for the atomic pair model.

Organisation(s)

Institute of Quantum Optics
CRC 1227 Designed Quantum States of Matter (DQ-mat)

External Organisation(s)

Physikalisch-Technische Bundesanstalt PTB

Type

Article

Journal

Physical Review A

Volume

95

ISSN

2469-9926

Publication date

25.04.2017

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

Electronic version(s)

https://doi.org/10.48550/arXiv.1702.00710 (Access: Open)
https://doi.org/10.1103/PhysRevA.95.043422 (Access: Closed)