High-Resolution Absorption Cross Sections of Formaldehyde in the 30285–32890 cm–1 (304–330 nm) Spectral Region

• DOI: 10.1021/jp210008g
• Publication Date: 2012-01-10T15:43:18Z
• Authors: Cheryl Tatum Ernest; Dieter Bauer; Anthony J. Hynes
• Keywords: Formaldehyde; Temperature; Spectrophotometry, Ultraviolet; 01 natural sciences; 0105 earth and related environmental sciences

Absolute room temperature (294 ± 2 K) absorption cross sections for the Ã(1)A(2)-X̃(1)A(1) electronic transition of formaldehyde have been measured over spectral range 30,285-32,890 cm(-1) (304-330 nm) using ultraviolet (UV) laser spectroscopy. Accurate high-resolution are essential atmospheric monitoring and understanding photochemistry this important compound. Absorption were obtained at an instrumental resolution better than 0.09 cm(-1), which is slightly broader Doppler width a rotational line 300 K (∼0.07 cm(-1)) so we able to resolve all but most closely spaced lines. Comparisons with previous data as well computer simulations made. Pressure broadening was studied collision partners He, O(2), N(2), H(2)O resulting parameters increase strength intermolecular interaction between partner. The pressure coefficient order magnitude larger coefficients O(2) N(2) will contribute significantly in lower atmosphere. Spectral made available Supporting Information.