Verification of L-alanine single-crystallinity for anisotropic synchrotron terahertz measurements

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dc.contributor.authorAllen, Jen_AU
dc.contributor.authorSanders, Ten_AU
dc.contributor.authorHorvat, Jen_AU
dc.contributor.authorRule, KCen_AU
dc.contributor.authorLewis, RAen_AU
dc.date.accessioned2023-09-25T01:59:28Zen_AU
dc.date.available2023-09-25T01:59:28Zen_AU
dc.date.issued2021-11-25en_AU
dc.date.statistics2023-04-24en_AU
dc.description.abstractOne way to probe the molecular interactions of a material is by using terahertz (THz) spectroscopy, which has been used to study L-alanine in detail [1]. However, isotropic THz spectroscopy has limitations in identifying the origin of vibrational modes since the direction of the associated dipole moment is random in an isotropic THz measurement. Therefore, there is a benefit to performing anisotropic (polarised) THz measurements. This work represents the first anisotropic measurements performed on L-alanine, the simplest chiral amino acid, and one of the earliest amino acids fundamental to early life on Earth [2]. An appropriate sample for anisotropic measurements must be highly single-crystalline. This presentation describes a method to prepare and test a sample for anisotropic THz measurements. Samples have been grown at the University of Wollongong, and sample verification has been done at ACNS’s Taipan triple-axis spectrometer. Using Taipan, a narrow mosaic spread of ~0.8° was determined, and single, well-fitted Gaussian peaks were observed in both sample rotation and Q-space scans, suggesting high single-crystallinity in our L-alanine samples. Additionally, the Taipan measurements were able to verify the orientation of the L-alanine single crystals with respect to their crystallographic axes. Anisotropic THz measurements were taken on the THz – Far Infrared beamline at the Australian Synchrotron using a wire-grid polariser. Distinct absorption bands were observed for different crystal orientations, further confirming single-crystallinity, and identifying the dipole moment directions for the observed modes. We thus demonstrate a method of performing anisotropic THz measurements. © 2021 The Authorsen_AU
dc.identifier.articlenumber182en_AU
dc.identifier.citationAllen, J., Sanders, T., Horvat, J., Rule, K., & Lewis, R. (2021). Verification of L-alanine single-crystallinity for anisotropic synchrotron terahertz measurements. Presentation to the ANSTO User Meeting, Online, 24-26 November 2021. Retrieved from: https://events01.synchrotron.org.au/event/146/contributions/4343/contribution.pdfen_AU
dc.identifier.conferenceenddate2021-11-26en_AU
dc.identifier.conferencenameANSTO User Meeting 2021en_AU
dc.identifier.conferenceplaceOnlineen_AU
dc.identifier.conferencestartdate2021-11-24en_AU
dc.identifier.urihttps://events01.synchrotron.org.au/event/146/contributions/4343/contribution.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15126en_AU
dc.language.isoenen_AU
dc.publisherAustralian Nuclear Science and Technology Organisationen_AU
dc.relation.urihttps://events01.synchrotron.org.au/event/146/contributions/4343/contribution.pdfen_AU
dc.subjectVerificationen_AU
dc.subjectAlanine-Len_AU
dc.subjectAnisotropyen_AU
dc.subjectSynchrotronsen_AU
dc.subjectTHZ rangeen_AU
dc.subjectSpectroscopyen_AU
dc.subjectOscillation modesen_AU
dc.subjectAmino acidsen_AU
dc.subjectDipolesen_AU
dc.titleVerification of L-alanine single-crystallinity for anisotropic synchrotron terahertz measurementsen_AU
dc.typeConference Presentationen_AU
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