Fig. 5: Time-resolved dual-comb spectra of HCOOH and CO. | Communications Chemistry

Fig. 5: Time-resolved dual-comb spectra of HCOOH and CO.

From: Direct gas-phase formation of formic acid through reaction of Criegee intermediates with formaldehyde

Fig. 5

The spectra were measured in the regions 1127.93−1128.54 cm−1 (a) and (c) and 2218.64−2219.09 cm−1 (b) and (d). The spectra a and b were recorded simultaneously after the 248-nm irradiation of a flowing mixture of CH2I2/HCHO/O2/N2 (0.016/0.123/14.9/0.04 Torr, PT = 15.1 Torr, 296 K) over 5000 excimer laser shots. The spectra c and d were measured simultaneously after 248-nm laser photolysis of the flowing mixture of CH2I2/O2/N2 (0.016/14.9/0.04 Torr, PT = 15.0 Torr, 296 K) over 5000 excimer laser shots. Here, the spectral sampling spacing is 288 MHz (9.6 × 10−3 cm−1) and the temporal resolution is 12 μs.

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