4/24/2023 0 Comments Halogen elements![]() Our model predicts diffuse cloud HCl abundances that are similar to those predicted previously and detected tentatively toward ζ Oph. This disagreement suggests that the reaction of C + with HF proceeds more slowly than the capture rate assumed in our model a laboratory measurement of this reaction rate would be very desirable. Our updated model now overpredicts the CF + abundance by a factor gsim10 relative to observations of the Orion Bar this discrepancy has widened because we now adopt a laboratory measurement of the CF + dissociative recombination rate that is smaller than the estimate we adopted previously. As in our previous study of fluorine-bearing interstellar molecules, we predict HF to be the dominant gas-phase reservoir of fluorine within both diffuse and dense molecular clouds we expect the Herschel Space Observatory to detect widespread absorption in the HF J = 1 - 0 transition. We present predictions for the abundances of the three halogen molecules that have been detected to date in the interstellar medium: HF, CF +, and HCl. We have modeled both diffuse and dense molecular clouds, making use of updated estimates for the rates of several key chemical processes. Here, we present a theoretical study of the chemistry of interstellar molecules containing the halogen elements chlorine and fluorine. Although they are only minor constituents of the interstellar medium, halogen-containing molecules are of special interest because of their unique thermochemistry.
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