scholarly journals Detection of Deuterated Formaldehyde in Interstellar Clouds

1980 ◽  
Vol 87 ◽  
pp. 439-443
Author(s):  
William D. Langer ◽  
Margaret A. Frerking ◽  
Richard A. Linke ◽  
Robert W. Wilson
Keyword(s):  
Gas Phase ◽  
Interstellar Clouds ◽  
Gas Phase Chemistry ◽  
Phase Chemistry ◽  
First Time

AbstractDeuterated formaldehyde has been detected for the first time in interstellar clouds; the observed ratio HDCO/H2CO implies formation by gas phase chemistry.

scholarly journals Molecular Formation in Hot Diffuse Clouds

1980 ◽  
Vol 87 ◽  
pp. 273-280
Author(s):  
A. Dalgarno
Keyword(s):  
Gas Phase ◽  
Interstellar Clouds ◽  
Gas Phase Chemistry ◽  
Molecular Formation ◽  
Phase Chemistry ◽  
Diffuse Clouds

A description is given of the processes of molecular formation and destruction in diffuse interstellar clouds and detailed models of the clouds lying towards ζ Ophiuchi, ζ Persei and o Persei are used to assess the validity of gas phase chemistry. Modifications that may arise from shock-heated regions are discussed.

scholarly journals What Species Remain to be Seen?

1992 ◽  
Vol 150 ◽  
pp. 181-186 ◽  
Author(s):  
B. E. Turner
Keyword(s):  
Gas Phase ◽  
Refractory Element ◽  
Circumstellar Envelopes ◽  
Neutral Species ◽  
Interstellar Clouds ◽  
Gas Phase Chemistry ◽  
Element Chemistry ◽  
Thermochemical Equilibrium ◽  
Phase Chemistry ◽  
Laboratory Synthesis

We review what species remain to be seen for several types of astrochemistry: Thermochemical Equilibrium (TE) in circumstellar envelopes (CSEs); photo- and ion-molecule chemistry in CSEs; ion-molecule chemistry in cold interstellar clouds; grain chemistry (passive, catalytic, disruptive); and shock chemistry. In CSEs, a rich Si gas-phase chemistry is now recognized, and two predicted species (SiN, SiH2) have been seen. Others are predicted. In the ISM, a global picture of refractory-element chemistry predicts that compounds of Mg, Na, Fe, and possibly Al occur with detectable gas-phase abundance. Predicted species require laboratory synthesis and spectroscopy. Reactions of hydrocarbon ions with neutral species dominate the formation of the families CnH, HCnN, H2Cn, and CnO in both interstellar (TMC-1) and circumstellar (IRC10216) cases, and readily explain the favored values of n in each case as well as predicting which higher-n species remain to be seen. Confirmation of H3O+ (interstellar) is discussed.

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