“…More recently there have been promising demonstrations that the brightness of synchrotron sources is useful for gas-phase studies with high spectral resolution, particularly in the far-infrared region [13][14][15][16]. At the CLS, the far-infrared beamline has already been used for detailed studies of a number of molecules, including acrolein [17][18][19], thiophene [20], pyrrole [21], b-propiolactone [22], methyl silane [23], and methanol [24]. The excellent spectral resolution achieved in these studies (often <0.001 cm…”