PMA50 - External Polarization Modulation Accessory
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Bruker's PMA50 is a fast and powerful external optics module for the TENSOR, INVENIO and VERTEX series FTIR 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 FTIR 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's TENSOR, INVENIO 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, INVENIO and VERTEX series spectrometers, the signal quality can be optimized with respect to the desired spectral range and sample size. FTIR

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) The innovative designed synchronous demodulator integrated in the electronic units of the Bruker TENSOR, INVENIO and VERTEX series FTIR spectrometers replaces the traditional external electronic lock-in amplifier. This state of the art demodulation technology is easy to handle and provides at least comparable demodulation efficiency like an external lock-in amplifier for PM-IRRAS and VCD experiments. PM-IRRAS reflection...