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1,3,5-trioxane, often used as a solid fuel or source of formaldehyde, is a symmetric top of the C3v group. Although the microwavea and low-resolution vibrational spectrab have been studied extensively, only the ν17 band near 1072 cm−1has been observed with rotational resolutionc. Here, we will present our studies of trioxane vapor from 1140-1220 cm−1, covering the ν16 band at a resolution of approximately 30 MHz. Solid trioxane was heated, and the resulting vapor was entrained in a continuous supersonic expansion of argon. Continuous-wave cavity ringdown spectroscopy was then performed using a frequency-stabilized external cavity quantum cascade laser (EC-QCL) as the light source. In addition to providing new ro-vibrational transition frequencies of trioxane, the present work serves to validate our newly-developed EC-QCL spectrometer and will be used to evaluate the cooling performance of the sheath-flow supercritical fluid expansion source currently under developmentd.

HIGH-RESOLUTION SPECTROSCOPY OF THE ν16 BAND OF 1,3,5-TRIOXANE