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Hemoglycin visible fluorescence induced by X-rays

DOI: 10.1063/5.0143945 DOI Help

Authors: Malcolm W. Mcgeoch (PLEX Corporation) , Robin Owen (Diamond Light Source) , Sofia Jaho (Diamond Light Source) , Julie E. M. Mcgeoch (Harvard-Smithsonian Center for Astrophysics)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Chemical Physics

State: Published (Approved)
Published: February 2023
Diamond Proposal Number(s): 31420

Open Access Open Access

Abstract: Hemoglycin, a 1494 Da polymer composed of iron and glycine has been detected in several carbonaceous meteorites. Iron atoms close out the ends of a 5nm anti-parallel glycine beta sheet and contribute visible and near infrared absorptions that are not present with glycine alone. The 483nm absorption of hemoglycin was discovered in theory and then observed on beamline I24 at Diamond Light Source. Light absorption in a molecule involves a coupled lower set of states receiving light energy that causes a transition into an upper set of states. In the reverse process some energy source, such as an X-ray beam, populates the upper set of molecular states, which then radiates light as it returns to the lower "ground" set of states. We report on visible light re-emission during X-ray irradiation of a hemoglycin crystal. The emission is dominated by bands centered at 489nm and 551nm.

Diamond Keywords: Meteorites

Subject Areas: Physics, Chemistry, Materials

Instruments: I24-Microfocus Macromolecular Crystallography

Added On: 28/02/2023 09:26


Discipline Tags:

Earth Sciences & Environment Physics Physical Chemistry Chemistry Materials Science Geology Polymer Science Planetary Geology Astronomy & Astrophysics

Technical Tags:

Diffraction Macromolecular Crystallography (MX)