研究目的
Studying the absolute intensities of the absorption lines of the 2ν7 and ν2 bands of the CH2 = CD2 molecule in the region 1450–1650 cm–1, as it is relevant for fundamental and applied science, including environmental monitoring, plant biology, and astrophysics.
研究成果
The absolute intensities of absorption lines for the CH2 = CD2 molecule were measured for the first time, providing data that can be used to determine parameters of the effective dipole moment of ethylene and support further research in spectroscopy and related fields.
研究不足
The analysis was limited to unsaturated isolated lines with intensities significantly above the noise level. The study focuses on a specific spectral region and molecule, and may not generalize to other conditions or molecules.
1：Experimental Design and Method Selection:
The experiment involved recording the infrared spectrum of the CH2 = CD2 molecule using a Fourier spectrometer to measure absorption line intensities. The Bouguer–Lambert–Beer law and Hartmann–Tran profile were used for analysis.
2：Sample Selection and Data Sources:
A gas sample of CH2 = CD2 with chemical purity greater than 99% was purchased from CDN Isotopes. The spectrum was recorded at a pressure of 138 Pa and temperature of 300 K.
3：List of Experimental Equipment and Materials:
Bruker IFS-120 HR Fourier spectrometer, multipass White cell (absorption path length
4：4 m), Globar infrared source, mercury-cadmium-tellurium (MCT) detector, and the gas sample. Experimental Procedures and Operational Workflow:
The spectrum was recorded in the 1450–1650 cm–1 region with a resolution of
5：0021 cm–The spectrum was calibrated using water vapor absorption lines. Line assignments were made using the combination differences method with ground state energies from previous work. Data Analysis Methods:
The optical thickness was calculated from experimental intensities using the Bouguer–Lambert–Beer law, and line shapes were modeled with the Hartmann–Tran profile to determine absolute intensities. Only unsaturated isolated lines above the noise level were analyzed.
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