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from Part V - Photodissociation
Published online by Cambridge University Press: 11 April 2023
Comparisons between low- and high-flux PDR conditions are discussed in relation to the Horsehead Nebula and the Orion Bar. Contrasting observations of selected species between the PDR margin and the inner dark cloud allow chemical modellers to test formation and destruction reaction networks against quite closely constrained physical conditions. The anomalous abundance of CH3CN is considered here in the Horsehead context in the presence of other nitrile COMs observed, as are comparisons of sulphur chemistry in the low- and high-flux cases and the latest ideas on the ISM sulphur reservoir.
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