Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 14, Issue 29, Pages 6550-6555Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.3c01468
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We present a novel technique for detecting molecules desorbed from an ice surface using broad-band millimeter-wave rotational spectroscopy. The method allows for the investigation of molecules that have undergone temperature-programmed desorption (TPD), similar to the warming phase of icy grains in the interstellar medium. The detection is conformer-and isomer-specific and quantitative, enabled by chirped-pulse rotational spectroscopy.
Wepresent a new technique for the detection of molecules desorbedfrom an ice surface using broad-band millimeter-wave rotational spectroscopy.The approach permits interrogation of molecules that have undergonethe slow warmup process of temperature-programmed desorption (TPD),analogous to the warmup phase of icy grains in the interstellar mediumas they approach the central protostar. The detection is conformer-and isomer-specific and quantitative, as afforded by chirped-pulserotational spectroscopy. To achieve this, we combine ice TPD withbuffer gas cooling, followed by detection in the millimeter-wave regime.In this report we examine the TPD profiles of n-and i-propanol, the former of which may be in fivedifferent conformational isomeric forms, and which display distinctdesorption profiles. The limited conformational isomerization andtemperature-dependent relative yields of n-propanolconformers observed show that the desorption is highly conformer-specific.
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