2024/11/30 by Swapnil Patel, Patel, Swapnil, Kenneth R. Brown +1 · 2 citations
Physics and Astronomy · Chemistry · #Atomic and Molecular Physics #Nuclear Physics and Applications #Spectroscopy and Laser Applications
paper · pdf · doi:10.48550/arxiv.2412.00362
We present high-resolution rovibronic spectroscopy of calcium monohydride molecular ions (CaH+) co-trapped in a Coulomb crystal with calcium ions (40Ca+), focusing on rotational transitions in the |X1Σ+, ν" = 0> → |A1Σ+, ν' = 2> manifold. By resolving individual P and R branch transitions with record precision and using Fortrat analysis, we extract key spectroscopic constants for the excited state |A1Σ+, ν' = 2>, specifically, the band origin, the rotational constant, and the centrifugal correction. Additionally, we demonstrate the application of high-resolution rotational spectroscopy of CaH+ presented here as an in-situ probe of local environmental temperature. We correlate the relative amplitudes of the observed transitions to the underlying thermalized ground-state rotational population distribution and extract the black-body radiation (BBR) temperature.