Detectors cadmium telluride

The infrared spectra were recorded by an evacuable FT-IR spectrometer, Broker IFS-113v, equipped with a liquid nitrogen cooled MCT (mercury cadmium telluride) detector. All infrared spectra showed were obtained by substraction of the background (oxide) spectrum, recorded at the same temperature. 

Spectra were measured at 4 cm"1 resolution with a Nicolet 740 Fourier transform infrared (FT-IR) spectrometer equipped with a medium range mercury-cadmium-telluride detector. A series of 128 scan spectra (43 sec measurement time) was collected every 5 min for the first hour and then every 10 min for 3 hr. At the end of the 4 hr period, saline or Milli-Q water of the same pH was substituted for the polymer solution and the data acquistion program was restarted. 

Figure 17.4 Schematic of the T-jump spectrometer described in the text. OAP, off-axis parabolic mirror PB, Pellin—Broca prism P, polarizer L, lens S, sample MCT, mercury cadmium telluride detector. The size of the pump relative to the probe at the point of overlap is shown in the lower left comer.

In another approach to form a detector array a mercury cadmium telluride detector chip is directly contacting or directly glued to a read-out chip. These detector arrays are presented in chapter 2.S. An advantage is that the assembly of mercury cadmium and read-out chip may be processed in a silicon-like fashion. A separate section is provided fi>r detector arrays having through holes formed in the mercury cadmium telluride through which the detector elements are connected to the read-out chip [26]. Such a detector array is shown in figure S [27]. 

The cure of PMR-15 and its model compound 4,4 -methylene dianiline bi-snadimide (MDA, BNI) has been studied by simultaneous reaction monitoring and evolved gas analysis (SIRMEGA) using a FTIR with a mercury-cadmium telluride detector. The system allows the observation of the variation in IR spectra correlated to the gas evolution during the curing. The data show that the cy-clopentadiene evolution involves only minor modifications in the spectrum [39]. 

The FT-IR spectrometer (Bruker Vertex 70) and the MCT (mercury cadmium telluride) detector are moved out of the accelerator room to be protected against radiation (Fig. 4). The infrared beam is guided on a distance of six meters by dried air or Nj-purged gold coated optical conduits and mirrors. The spectra are obtained from 100 scans with a 4 cm" resolution. Under our conditions, 24 seconds are required to record a spectrum. It is thus possible to follow the evolution of the spectra after irradiation by recording spectra every 30 seconds, for example. In all cases, spectra of irradiated samples are recorded with reference to the same sample just before irradiation, which allows detecting the effects of irradiation by measuring its... 

The infrared-electrochemical cell, originally designed by Bewick and his coworkers, was partly modified to introduce an electrode from the upper part of the cell. The front side of the cell is attached with a CaFg optical window, and the backside with a glass syringe which pushes the electrode against the window. The Fourier transform infrared measurements were conducted at 0 °C for Cu electrodes and at ambient temperature for Ni and Fe electrodes by JIR-6000 (Nihon Densi, Co. Ltd.) externally equipped with an MCT (mercury-cadmium-telluride) detector. Infrared spectra were acquired by the subtraction of two spectra reflected from the electrode at different potentials (SNIFTIRS). The other details were described previously. [9]... 

The short-term reproducibility of infrared absorption spectroscopy in the determination of the oxygen content of a typical production silicon wafer can be good, as shown in Figure 7. These data represent twenty-four consecutive measurements of a single spot on a silicon wafer with an etched back surface. The data were obtained at 4 cm resolution on an FT-IR spectrophotometer equipped with a mercury cadmium telluride detector, a KBr/Ge beamsplitter and a Globar ( )... 

Instrumentation. Spectra were acquired with a Nicolet 60SX FTIR spectrometer, continuously purged with dry air and equipped with a liquid-nitrogen-cooled, wideband mercury-cadmium telluride detector. Coaddition of 100 interferometer scans at 8-cm 1 resolution was employed. The location of absorption maxima was confirmed by spectra taken at l-cm 1 resolution. All spectra were converted into Kubelka-Munk units prior to use. Integration of peak areas was accomplished by using software available on the Nicolet 60SX. All peak areas were normalized to the 1870-cm-1 Si-O-Si combination band (15). 

Data collection. Two data sets are used to demonstrate the multiscale cluster analysis method and have been kindly provided by Dr. Roy Goodacre at Institute of Biological Sciences. University of Wales, Aberystwyth [64,65]. Ten microlitre aliquots of bacterial suspensions were evenly applied onto a sand-blasted aluminium plate. Prior to analysis the samples were oven-dried at 50°C for 30 min. Samples were run in triplicate. The FT-IR instrument used was the Bruker IFS28 FT-IR spectrometer (Bruker Spectro-spin, Banner Lane, Coventry, UK) equipped with an MCT (mercury-cadmium-telluride) detector cooled with liquid Ni. The aluminium plate was then loaded onto the motorised stage of a reflectance TLC accessory. The wave-... 

The spectrometer was a commercial (Mattson Instruments) Fourier Transform Infrared Interferometer (FTIR) equipped with both a liquid nitrogen-cooled mercury-cadmium-telluride detector and an inium antimonide detector. The instrument was modified into an emission FTIR by the removal of the source and relocating mirrors as shown in Fig. 9. 

DRIFT analysis was performed using a Bruker IFS28 infra-red spectrometer equipped with a diffuse-reflectance TLC attachment (Bruker Spectrospin Ltd., Banner Lane, Coventry CV4 9GH, UK.) and a liquid N2-cooled MCT (Mercury-Cadmium-Telluride) detector. Unprocessed culture supernatants (5pl four replicates) were dried in the wells of a sandblasted aluminium plate mounted on a motorised stage and infra-red spectra were collected in the range 4000/cm-i-600/cm-i with 1 or 16 co-adds. Spectral data were converted into ASCII format for chemometric processing. 

Transmitted IR spectra for rocks and minerals are generally measured by making thin sections of samples with thicknesses of from 20 to 200 pm, which depend on concentrations and absorption coefficients based on Beer-Lambert law. A Fourier Transform IR microsjjectrometer totally used in this study is equipped with a silicon carbide (globar) IR source and a Ge-coated KBr beamsplitter. IR light through a sample is measured using a mercury-cadmium-telluride detector. 

The ATR fibre system was built up by a FT-IR spectrometer Bruker Matrix F in connection with an ATR fibre probe (A.R.T. Photonics, Berlin 0 12 mm) and a MCT (mercury cadmium telluride) detector (Belov Technology, Co., Inc.). The probe was directly inserted through the ground neck of the reaction vessel and comprised two 1 m silver halide fibres (0 1 mm) connected to a conical two bounce diamond ATR element housed in a rod of hastelloy. Using this set-up it was possible to follow the reactions to be studied in real-time covering a spectral range from 600 to 2000 wavenumbers. 

Chemical composition of the fibers was analyzed using a Bruker Equinox 55 IR spectrophotometer, equipped with a Mercury Cadmium Telluride detector and a nitrogen purged microscope attachment. The instrument operation parameters were as follows 4.0 cm resolution, 520 scans per... 

Peck and co-workers [73] used near-FT-IR spectrometry to achieve improved sensitivity over previous near-IR techniques. A mercury-cadmium-telluride detector has sufficient sensitivity in the 4600-4500 cm region to monitor the epoxide response at the 4532 cm combination with an adequate S/N ratio. Co-addition of the interferograms can further diminish the inherent detector noise. Data manipulation routines can... 

Fig. 3.1 Dependence of nonequilibrium depletion factor on cutoff wavelength for mercury cadmium telluride detector. Solid lines (numbers without prime) radiative lifetime calculated without reabsorption. Dashed lines (primed numbers) ninefold increase of lifetime due to reabsorption. Curve 1 300 K, curve 2 220 K, curve 3 180 K, curve 4 77 K...

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