PMA50 - External Polarization Modulation Accessory
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Bruker's PMA50 is a fast and powerful external optics module for the TENSOR and VERTEX series FT-IR spectrometers for polarization modulation measurements. High sensitivity and dynamics Parallel dual channel data acquisition technique (24bit) enables the measurement of the sum and the difference spectrum at the same time Photo Elastic Modulator (PEM) ZnSe, 42 kHz nominal frequency, AR coated Continuously variable spectral resolution, depending on basic FT-IR spectrometer Large sample compartment for a variety of different sampling accessories Adjustment of spot size on the sample allows for measurement of smaller samples or liquid cells with smaller windows Full-integrated demodulation electronics for compact design and easy operation Innovation with Integrity External Polarization Modulation Accessory Polarization modulation (PM) provides advantages for a variety of different techniques such as PM-IRRAS, VLD (Vibrational Linear Dichroism) and VCD (Vibrational Circular Dichroism). The applied double modulation techniques overcome residual atmospheric absorptions that tend to mask desired spectral information even in purged systems. In combination with Bruker's real dual channel acquisition technique (DigiTectTM) external signal disturbances are prevented and highest signal-to-noise ratio is guaranteed. High Performance and Stability The PMA50 module utilizes the high performance characteristics of Bruker Optics' TENSOR and VERTEX series spectrometers. Data acquisition is based on real dual channel delta-sigma ADCs with 24bit dynamic range, running in parallel and are integrated into the detector preamplifier electronics. This advanced, patented DigiTect™ technology prevents external signal disturbance and guarantees highest signal-to-noise ratio. In combination with the optical filter holder for a user selectable exchange of filters and the internal aperture wheel of TENSOR and VERTEX series spectrometers, the signal quality can be optimized with respect to the desired spectral range and sample size. FT-IR

1730 cm-1 : n (C=O), Ester 1608 cm-1 : n (C=C), Aromatic 1440 cm-1 : das(-CO-O-CH3 ) 1426 cm-1 : n (C=C), Aromatic 1289 cm-1 : n (C-O), Ester 1265 cm-1 : n (C-O) Demodulation Technology PM-IRRAS reflection measurements can be performed between angles of 70 and 89°. If larger angles are of interest, Bruker Optics’ PMA50XL module will offer access to a range between 32.5° to 89°. For easy sample adjustment, a continuously variable rotation stage and self-masking sample mount with fixed focal point at the sample reflecting surface is included. In VCD and VLD experiments, liquid, gas cells and...