Jet-cooled infrared absorption spectrum of the v(4) fundamental band of crossMark HCOOH and HCOOD

摘要

The jet-cooled absorption spectrum of the v(4) fundamental band of normal formic acid (HCOOH) and deuterated formic acid (HCOOD) was recorded in the frequency range of 1370-1392 cm(-1) with distributed-feedback quantum cascade lasers (DFB-QCLs) as the tunable infrared radiations. A segmented rapid-scan data acquisition scheme was developed for pulsed supersonic jet infrared laser absorption spectroscopy based on DFB-QCLs with a moderate vacuum pumping capacity. The unperturbed band origin and rotational constants in the excited vibrational state were determined for both HCOOH and HCOOD. The unperturbed band-origin locates at 1379.05447(11)cm(-1) for HCOOH, and 1366.48430 (39) cm(-1) for HCOOD, respectively. (C) 2017 Elsevier Inc. All rights reserved.