A fibre-coupled UHV-compatible variable angle reflection-absorption UV/visible spectrometer

Stubbing, J W, Salter, T L, Brown, W, Taj, S and McCoustra, M R S (2018) A fibre-coupled UHV-compatible variable angle reflection-absorption UV/visible spectrometer. Review of Scientific Instruments, 89 (054102). pp. 1-6. ISSN 0034-6748

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We present a novel UV/visible reflection-absorption spectrometer for determining the refractive index, n, and thicknesses, d, of ice films. Knowledge of the refractive index of these films is of particular relevance to the astrochemical community, where they can be used to model radiative transfer and spectra of various regions of space. In order to make these models more accurate, values of n need to be recorded under astronomically relevant conditions, that is, under ultra-high vacuum (UHV) and cryogenic cooling. Several design considerations were taken into account to allow UHV compatibility combined with ease of use. The key design feature is a stainless steel rhombus coupled to an external linear drive (z-shift) allowing a variable reflection geometry to be achieved, which is necessary for our analysis. Test data for amorphous benzene ice is presented as a proof of concept, the film thickness, d, was found to vary linearly with surface exposure and a value for n of 1.43 ± 0.07 was determined.

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Subjects: Q Science > QD Chemistry > QD0450 Physical and theoretical chemistry
Depositing User: Wendy Brown
Date Deposited: 24 Apr 2018 16:32
Last Modified: 02 Jul 2019 15:36
URI: http://sro.sussex.ac.uk/id/eprint/75396

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Project NameSussex Project NumberFunderFunder Ref
Evolution of ices: From molecular cloud to oceanG1613STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/M000869/1