Precise Determination of Excited State Rotational Constants and Black-Body Thermometry in Coulomb Crystals of Ca+ and CaH+

IF 2.7 2区化学 Q3 CHEMISTRY, PHYSICAL

The Journal of Physical Chemistry A Pub Date : 2025-04-16 DOI:10.1021/acs.jpca.5c0022910.1021/acs.jpca.5c00229

Swapnil Patel, and , Kenneth R. Brown*,

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Abstract

We present high-resolution rovibronic spectroscopy of calcium monohydride molecular ions (CaH⁺) cotrapped in a Coulomb crystal with calcium ions (⁴⁰Ca⁺), focusing on rotational transitions in the $| X^{1} Σ^{+}$ , 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 the local environmental temperature. We correlate the relative amplitudes of the observed transitions to the underlying thermalized ground-state rotational population distribution and extract the blackbody radiation (BBR) temperature.

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Ca+和CaH+的库仑晶体中激发态旋转常数的精确测定和黑体温度

我们提出了一氢化钙分子离子（CaH+）与钙离子（40Ca+）共捕获在库仑晶体中的高分辨率振动光谱，重点关注|X1Σ+， ν″= 0⟩→|A1Σ+, ν ' = 2⟩流形中的旋转跃迁。通过以记录精度解析单个P和R分支跃迁并使用Fortrat分析，我们提取激发态|A1Σ+， ν ' = 2⟩的关键光谱常数，特别是带原点，旋转常数和离心校正。此外，我们展示了高分辨率旋转光谱的应用，在这里提出的CaH+作为局部环境温度的原位探针。我们将观测到的跃迁的相对振幅与底层热化基态旋转种群分布联系起来，并提取黑体辐射（BBR）温度。

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来源期刊

The Journal of Physical Chemistry A 化学-物理：原子、分子和化学物理

CiteScore

5.20

自引率

10.30%

发文量

922

审稿时长

1.3 months

期刊介绍： The Journal of Physical Chemistry A is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.