Experiment
Title
Vis-NIR reflectance spectra of biomolecules dry powders at 293±2 K
Database
Experimentalists
Type(s)
laboratory
Description
Reflectance spectra (from 0.38 to 2.4 µm) of commercial powders of some of the main terrestrial biomolecules were measured at room temperature (~293 K) and pressure (~1 atm): proteins, DNA, phospholipids, carbohydrates, pigments (porphyrins, carotenoid)
Variable(s)
sample composition
Number of spectra
9
Instrument
SCITEAS Imaging System
Sample holder
The SCITEAS chamber was fully open, at room temperature and pressure. The samples were deposited on top of a big aluminum cylinder, directly below the imaging system (no window).
Standard medium
air
Spectral range type(s)
Vis, NIR
Valid spectral range(s)
Min - Max (${\mu}m$) Sampling (${\mu}m$) Resolution (${\mu}m$) Position accuracy (${\mu}m$) Absorption edge
#1 0.38 - 0.96 0.02 0.015
#2 0.96 - 2.4 0.01 0.03
Emergence angle(s)
13.0°
Azimuth angle(s)
0.0°
Comments
The light beam emitted from the extremity of the fibre bundle positionned about 300 mm above the sample surface has a divergence half-angle of 12.7°. The light source incidence and azimuth angles are slightly variable from pixel to pixel.
Illumination
Observation
Comments
partial polarization variable with wavelength (from monochromator grating)
Observation mode
roi averaged
Date begin - end
2014-02-12 - 2014-02-25
Publications
Comments
This experiment presents data shown in Figure 2 of the publication.