研究目的
Investigating the high-resolution spectral analysis of nitryl chloride (ClNO2) in the 12.6 μm region to understand its ro-vibrational energy levels and potential for atmospheric detection.
研究成果
The high-resolution Fourier transform spectrum of ClNO2's 12.6 μm absorption bands was thoroughly analyzed, revealing detailed ro-vibrational energy levels and interactions. The synthetic line list produced is valuable for future atmospheric ClNO2 measurements, especially utilizing the sharp Q branches of the ν2 bands for detection.
研究不足
The study's limitations include the empirical character of the Hamiltonian parameters, which depend on the accuracy and set of observed energy levels. The interaction modeling complexity increases with the number of terms in the expansions of the interacting terms.
1：Experimental Design and Method Selection
The study utilized a Fourier transform spectrometer and the SOLEIL synchrotron light source for high-resolution spectral recording. A Hamiltonian model was employed to analyze the ro-vibrational energy levels, accounting for Coriolis and Fermi resonances.
2：Sample Selection and Data Sources
ClNO2 was isolated from chlorine nitrate studies and introduced into a multipass White cell. The spectrum was recorded over 320 scans in the range 600–980 cm?1 at 0.23 hPa and 250 K.
3：List of Experimental Equipment and Materials
Fourier transform spectrometer, SOLEIL synchrotron light source, multipass White cell made of inert materials, KBr/Ge beamsplitter, home-made detector, 600–980 cm?1 bandpass optical filter.
4：Experimental Procedures and Operational Workflow
The sample was prepared through fractional distillations and introduced into the cell. Background and sample spectra were recorded at 250 K, with the sample pressure measured using a PTFE-coated capacitive pressure sensor. The spectrum was ratioed against a background spectrum for analysis.
5：Data Analysis Methods
A Hamiltonian model was used to fit the ro-vibrational energy levels, considering interactions between different vibrational states. The analysis included the assignment of lines and the determination of band centers and rotational constants.
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