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We studied neutral barium atoms in a neon crystal using matrix isolation spectroscopy. This research provides crucial data on barium atom properties in cryogenic environments, aiding future electron electric dipole moment searches.

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Area of Science:

  • Atomic Physics
  • Spectroscopy
  • Cryogenics

Background:

  • Matrix isolation spectroscopy allows probing atomic properties in controlled cryogenic environments.
  • Previous studies investigated barium atoms in noble gas hosts, but neon matrices present unique challenges and opportunities.

Purpose of the Study:

  • To spectroscopically investigate neutral barium atoms in a neon cryogenic crystal at 6.8 K.
  • To determine matrix-induced energy level shifts, inhomogeneous linewidths, and lifetimes of barium atoms.
  • To understand radiative pathways and relaxation channels affecting barium energy levels in neon.

Main Methods:

  • Matrix isolation spectroscopy at 6.8 K.
  • Excitation using 10-ns laser pulses at 355 nm to observe fluorescence cascades.
  • Tunable continuous-wave laser spectroscopy (700-900 nm) for energy level shifts, linewidths, and lifetime measurements.

Main Results:

  • Observed visible and near-infrared emission spectra of barium in neon.
  • Determined matrix-induced shifts and inhomogeneous linewidths of barium transitions.
  • Measured the lifetime of the barium 5d6s 3D1 state as 0.39 ± 0.02 s, with a predicted increase at lower temperatures.

Conclusions:

  • Confirmed multiple radiative pathways and matrix-induced relaxation channels in barium's 5d6s and 6s6p manifolds.
  • The study provides essential data for future electron electric dipole moment searches using barium monofluoride in neon matrices.
  • Neutral barium atoms in neon matrices are identified as potential sources of background and systematic limitations in sensitive experiments.