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<https://discovery.ucl.ac.uk/id/eprint/10197272> <http://purl.org/dc/terms/title> "A High Spatial Resolution View of the Early Stages of Low Mass Star Formation: Understanding the Energetic Processes at Work"^^<http://www.w3.org/2001/XMLSchema#string> .
<https://discovery.ucl.ac.uk/id/eprint/10197272> <http://purl.org/ontology/bibo/abstract> "Molecules are found in almost all interstellar environments. Regions with high temperatures, ionisation rates, or intense UV radiation can be atomic in nature (e.g., coronal gas,\r\nstellar wind bubbles, hot ionised medium, HII regions). Where molecules exist, chemical reactions occur, and these reactions, strongly coupled to their environment, serve as\r\npowerful diagnostic tools. Observations and chemical modelling of molecules help us understand the current and historical conditions of the Interstellar Medium (ISM).\r\nChapter 2 of this thesis presents a revised approach to cosmic ray treatment in the\r\nUCLCHEM chemical modelling code. We account for the dependency of cosmic ray ionisation and H2 dissociation rates on column density and include the production and reaction\r\nof cosmic ray-induced excited species on grains. This work examines how these treatments\r\naffect prestellar core chemistry, revealing significant impacts on chemical abundances, with\r\nionisation dependency being the most critical factor. Comparisons with observational data\r\nshow that the new treatments better reproduce observed chemical abundances than the\r\nstandard approach.\r\nChapter 3 probes the deuterated isotopologues of formaldehyde (H2CO) and the formyl\r\nion (HCO+) in the Class 0/I protostar L1527 using ALMA data. With higher resolution\r\nthan previous studies, we examine deuteration distribution on small scales, finding systematic variance in deuteration on 100-1000 au scales.\r\nChapter 4 we present initial findings on the chemistry of S-bearing species around the\r\nCep E-A intermediate-mass hot corino. We see emission is concentrated near the corino,\r\nwith some outflow contribution. Our preliminary analysis suggests column densities of\r\n1014 − 1016 cm−2 and temperatures above 50 K. Our results suggest that sulphur chemistry of IM hot corinos is similar to that of low-mass counterparts."^^<http://www.w3.org/2001/XMLSchema#string> .
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