使用频率梳探测的甲烷亚多普勒双共振光谱
Sub-Doppler Double-Resonance Spectroscopy of Methane Using a Frequency Comb Probe
AI总结：
本文利用3.3 μm连续波光参量振荡器泵浦与1.67 μm频率梳探测，在200 cm⁻¹带宽内测量甲烷亚多普勒双共振跃迁，检测到36个阶梯型共振，实现了高温光谱无法完成的高激发能级精确指认。
摘要：
我们报告了甲烷中亚多普勒双共振跃迁的测量，使用3.3 μm连续波光学参量振荡器泵浦基频ν3带中的跃迁，并使用1.67 μm频率梳在200 cm⁻¹带宽范围内探测3ν3带中的阶梯型跃迁。我们针对9个泵浦跃迁检测到36个阶梯型共振，平均中心频率精度为1.7 MHz，受限于泵浦频率稳定性。谱线使用TheoReTS谱线列表以及不同相对泵浦/探测偏振下的强度比进行指认。该方法提供了高温光谱无法完成的高激发能级的精确指认。
英文摘要：
We report the measurement of sub-Doppler double-resonance transitions in methane using a 3.3 $μ$m continuous wave optical parametric oscillator to pump transitions in the fundamental $ν_3$ band and a 1.67 $μ$m frequency comb to probe ladder-type transitions in the 3$ν_3$ band over 200 cm$^{-1}$ of bandwidth. We detected 36 ladder-type resonances for 9 pumped transitions with average center frequency accuracy of 1.7 MHz, limited by the pump frequency stability. The lines are assigned using the TheoReTS line list, and the intensity ratios for different relative pump/probe polarizations. This method provides accurate assignment of highly excited energy levels that cannot be done using high temperature spectra.
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