The ν3 fundamental band of HDCO

Abstract

The ν 3 fundamental band (CO stretch) of HDCO at 1724 cm −1 has been studied using both conventional infrared absorption and CO laser Stark spectroscopy. In addition to the excited-state ( v 3 = 1) rotational constants, improved constants for the ground state of HDCO have been obtained by combining previous microwave data with some infrared combination differences. The following constants were determined: Constant Ground state v 3 = 1 state Units ν 0 1724.267 cm −1 A 198 119.75 198 210.4 MHz B 34 910.646 34 676.6 MHz C 29 561.488 29 331.3 MHz μ a 2.3302 2.3486 D μ b 0.195 0.190 D Additional results, and the uncertainties in these parameters, are listed in the paper.