Rugango René, Calvin Aaron T, Janardan Smitha, Shu Gang, Brown Kenneth R
School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
Schools of Computational Science and Engineering and Physics, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
Chemphyschem. 2016 Nov 18;17(22):3764-3768. doi: 10.1002/cphc.201600645. Epub 2016 Aug 25.
We report the measurement of the 1 Σ→2 Σ transition of CaH by resonance-enhanced photodissociation of CaH that is co-trapped with laser-cooled Ca . We observe four resonances that we assign to transitions from the vibrational v=0 ground state to the v'=1-4 excited states based on theoretical predictions. A simple theoretical model that assumes instantaneous dissociation after resonant excitation yields results in good agreement with the observed spectral features except for the unobserved v'=0 peak. This discrepancy is attributed to an insufficient understanding of the dissociation process, and further experimental and theoretical studies are required to confirm the assignment. The resolution of our experiment is limited by the mode-locked excitation laser, but this survey spectroscopy enables future rotationally resolved studies with applications in astrochemistry and precision measurement.
我们报告了通过与激光冷却的钙共捕获的氢化钙的共振增强光解离来测量氢化钙的1Σ→2Σ跃迁。基于理论预测，我们观察到四个共振峰，将其归因于从振动基态v = 0到激发态v' = 1 - 4的跃迁。一个简单的理论模型假设共振激发后立即解离，除了未观察到的v' = 0峰外，其结果与观察到的光谱特征吻合良好。这种差异归因于对解离过程的理解不足，需要进一步的实验和理论研究来确认归属。我们实验的分辨率受锁模激发激光的限制，但这种普查光谱学为未来在天体化学和精密测量中的应用进行转动分辨研究提供了可能。
