Calibration of the polarization of the beam at the microscopes’ focus point: (a) Globar plus external polarizer; (b) BM branch; and (c) ER branch. Horizontal axes correspond to the x-axis of the microscope stage and the electric vector of the synchrotron IR beam.
Comparison of the polarized spectra of oriented PET with and without external polarizer: (a) BM branch; (b) ER branch. Continuous line: beam; Dotted line: globar plus polarizer; ∥ and ⊥ refer to orientation of the sample draw axis with respect to the x-axis of the microscope stage.
Schematic representation of the line along which the spectra were acquired.
(a) Dichroic ratio for the 1340 cm−1 band (CH2 wagging mode) at both beamline branches. (b) Dichroic ratio for the 1505 cm−1 band (ring deformation mode) at both beamline branches.
1340/1370 cm−1 band ratio (trans to gauche conformers) from the calculated structural factor spectra along the line mapped.
Absorbance values for some PET bands, ratioed to the 1456 cm−1 band.
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