Mossbauer Spectroscopy in Bangladesh

WissEl Mossbauer spectrometers, drive systems, detectors and cryogenic accessories for hyperfine interaction studies.

40 products from 2 manufacturers: Lake Shore, WissEl.

Products

• Cryogen-Free Mossbauer Cryostats — Lake Shore: The CCS-800-205 is a closed-cycle cryostat optimised for Mossbauer spectroscopy, cooling powders and irregularly shaped solids in exchange gas. Vibration isolation keeps typical vibrational line broadening to 0.01 mm/s. The supporting stand includes lead shielding.
• MA-260S Mossbauer Velocity Transducer — WissEl: The standard model in the WissEl velocity transducer line. It moves the gamma source during a Mossbauer measurement using NdFeB and SmCo5 magnets that leave practically no magnetic fringe field at the source position, so it suits all common Mossbauer experiments.
• MVT-1000 Mossbauer Velocity Transducer — WissEl: The top model in the WissEl velocity transducer line, built on a massive steel housing with NdFeB and SmCo5 high field magnets. The small moving mass allows operation over a wide velocity range, and the absence of fringe fields suits bidirectional sources.
• MR-260 Mossbauer Drive Unit — WissEl: A basic Mossbauer drive unit that forms a complete drive system with any WissEl velocity transducer. It accepts any waveform from a WissEl digital function generator and sets maximum velocity from a front panel ten turn potentiometer.
• MR-260A Mossbauer Drive Unit — WissEl: A Mossbauer drive unit with an error minimisation facility, so the velocity transducer can be run away from its resonance frequency across roughly 1 to 100 Hz. A logarithmic LED bar shows the deviation of the motion from its ideal value.
• MR-360 Mossbauer Drive Unit — WissEl: A Mossbauer drive unit with error minimisation and a three and a half digit display of maximum velocity. The display is calibrated against a Mossbauer calibration measurement using a front panel adjustment screw, and an LED bar shows the relative error.
• MDU-1200 Mossbauer Drive Unit — WissEl: The top drive unit in the WissEl range, with laser based calibration. Connected to the MVC-450 calibrator it displays the velocity and channel number for each channel, and an internal microcomputer performs the channel to velocity conversion.
• MRG-500 Mossbauer Drive Unit — WissEl: A Mossbauer drive unit with a built-in digital function generator, designed for the MA-260 and MVT-1000 transducers. It supplies sine and triangle reference waveforms and digital start and channel advance pulses to synchronise a multichannel analyser.
• DFG-500 Digital Function Generator — WissEl: The entry level digital function generator for a Mossbauer drive system. It stores the reference waveform digitally and converts it with a DAC, and provides start and channel advance pulses to synchronise a multichannel analyser.
• DFG-1000 Digital Function Generator — WissEl: A digital function generator that provides eight waveforms including constant velocity modes with sinusoidal slopes, which reduce vibration disturbance. Digital generation keeps the source motion synchronous with the channel sweep of the multichannel analyser.
• DFG-1200 Digital Function Generator — WissEl: The top digital function generator in the WissEl range. In addition to the standard waveforms it provides a region of interest waveform that can be varied continuously from constant velocity to constant acceleration, concentrating counting time on the lines of interest.
• MVC-450 Mossbauer Velocity Calibrator — WissEl: A laser interferometer calibrator that assigns a velocity value to each channel of a Mossbauer spectrum. It generates a pulse train whose frequency is proportional to the instantaneous velocity, and a NIM module powers the interferometer and digitises its output.
• LND-45431 Proportional Counter — WissEl: A gas filled proportional counter used as the transmission detector in a Mossbauer spectrometer. The beryllium entrance window and argon, krypton or xenon filling give good efficiency at the low gamma energies used in Mossbauer spectroscopy.
• AMP-1000 Spectroscopy Main Amplifier — WissEl: A single width NIM spectroscopy main amplifier for Mossbauer work. It accepts positive and negative preamplifier pulses, delivers bipolar output pulses, and can supply power to a preamplifier through a rear panel connector.
• PEA-6 Preamplifier — WissEl: A charge sensitive preamplifier for proportional counters used in Mossbauer spectroscopy. It accepts positive or negative charge pulses and delivers an inverted output pulse into 50 ohm for the main amplifier.
• PEA-6A Preamplifier and Amplifier — WissEl: A combined charge sensitive preamplifier and main amplifier in one compact housing, designed for proportional counters. The bipolar output connects directly to the analogue input of a CMCA-550 or CMCA-650 data acquisition module.
• CMCA-550 Data Acquisition Module — WissEl: A data acquisition module for Mossbauer spectroscopy that runs with a personal computer. It combines multichannel scaling for spectrum collection with pulse height analysis, so an energy window set in PHA mode can be applied while Mossbauer data is acquired.
• HVS-2 High Voltage Power Supply — WissEl: A compact single width NIM high voltage supply for radiation detectors, available in 3 kV and 6 kV versions. It is short circuit and overload protected, and warns by flashing LED and tone if the overvoltage limit or the NIM bin supply fails.
• MBBC-HE0106 Mossbauer He/N2 Bath Cryostat — WissEl: A top loading stainless steel bath cryostat for low temperature Mossbauer spectroscopy with the source at ambient temperature. It runs on liquid helium or liquid nitrogen and allows the sample to be changed while cold.
• MBBC-N20106 Mossbauer N2 Bath Cryostat — WissEl: A liquid nitrogen top loading bath cryostat for Mossbauer spectroscopy with the source at ambient temperature. The stainless steel body and low consumption give long stand times, and samples can be exchanged in cold condition.
• TR-50 Temperature Controller — WissEl: A temperature controller for the WissEl Mossbauer bath cryostats. It reads a DT-670 silicon diode inside the cryostat through a four wire connection and drives the cryostat heater from a built-in Eurotherm 3216 control module.
• MBF-1100 Mossbauer Furnace — WissEl: A furnace for Mossbauer effect measurements in vacuum or gas from room temperature upwards. A quartz tube holds the sample holder and inner heat screens, and two pipe connections allow evacuation, gas filling or a continuous gas flow without dismantling the furnace.
• TR-55 Temperature Controller — WissEl: A temperature controller designed for the MBF-1100 Mossbauer furnace, with an output stage sized to heat that furnace. It reads a type K thermocouple inside the furnace and has an auto-tune facility for the control loop.
• RiKon-5 CEMS Detector — WissEl: A three wire gas flow proportional backscatter detector for conversion electron Mossbauer spectroscopy. It examines thin films and near surface layers without high vacuum, and can also detect re-emitted x-rays to probe deeper regions of the sample.
• MB-500 Mossbauer Bench — WissEl: The basic Mossbauer bench, consisting of an optical track with sliders, clamps and mounting elements for the velocity transducer, absorber and detector. The rigid design suppresses vibration that would otherwise broaden the Mossbauer lines.
• MB-500 VT Vertical Track — WissEl: A vertical track that mounts on the MB-500 base track for Mossbauer experiments in vertical geometry. It is supplied with source screening for vertical geometry and a holder that carries the velocity transducer upright.
• MB-600 Mossbauer Bench with Cryostat Stand — WissEl: A Mossbauer bench that adds a cryostat stand to the optical track, so a bath cryostat, velocity transducer and detector can be aligned together. The sectional aluminium frame can be filled with sand or lead shot to add mass and damp vibration.
• 57Co Mossbauer Sources in Rh Matrix — WissEl: Cobalt 57 Mossbauer sources in a rhodium matrix, supplied in several holder types. The cryogenic holder has a laser welded aluminium window for use from liquid helium temperature upwards, and a low absorption holder uses a Kapton window.
• 119mSn Mossbauer Sources in Ca-stannate Matrix — WissEl: Tin 119m Mossbauer sources in a calcium stannate matrix for tin Mossbauer spectroscopy. The holder body is made from titanium alloy and the beryllium window is brazed in place to seal the source. Several standard activities are offered as stock items.
• WAEMI-T1 Radiation Protection Safe — WissEl: A lockable safe for storing Mossbauer sources. The steel housing carries fire protection insulation and a 30 mm lead shield, and the front door is lockable. Other dimensions or shielding thicknesses are available on request.
• MA-260 Mossbauer Velocity Transducer — WissEl: Mossbauer velocity transducer from WissEl's transducer line, listed on the company's instrument list and named in the minimum, economy and standard spectrometer configurations. WissEl's drive unit pages give it as one of the transducers the MRG-500 drive unit is designed to control. The manufacturer publishes no separate data sheet page for this model.
• MBC-1L Mossbauer Bath Cryostat — WissEl: Bath cryostat for Mossbauer measurements, carried on WissEl's instrument list. The manufacturer publishes no separate data sheet page for this model, so no dimensions or temperature figures are quoted for it.
• MBF-1100TR Mossbauer Furnace with Temperature Controller TR-55 — WissEl: WissEl's instrument list gives MBF-1100TR as the MBF-1100 Mossbauer furnace supplied together with the TR-55 temperature controller. The furnace is built for Mossbauer effect measurements in vacuum or gas from room temperature upwards, around a quartz tube holding the sample holder and two inner heat screens, with kaolin cotton insulation and air cooling. Its construction allows the operating gas to be changed without taking the furnace apart or removing the sample, and the sample holder is made of steel with a high nickel content to resist aggressive gases at high temperature. The TR-55 adds a EUROTHERM 3216 control module with auto-tune, a pulse width controlled heater output and RS 232C remote control.
• MDAS-1 Data Acquisition System with Combined Preamplifier and Main Amplifier — WissEl: Complete counting and data acquisition chain for a Mossbauer spectrometer, built around a proportional counter and a combined preamplifier and main amplifier. The CMCA-550 module handles pulse height analysis and the MCS mode used to record Mossbauer spectra, and the set of cables to link the chain is included.
• MDAS-2 Data Acquisition System with Separate Main Amplifier — WissEl: Data acquisition system in which the preamplifier and the main amplifier are separate units, giving more freedom in setting up the pulse chain. It combines the LND-45431 proportional counter with the PEA-6 preamplifier and AMP-1000 spectroscopy amplifier, feeding the CMCA-550 acquisition module.
• MDAS-3N Data Acquisition System with CEMS Detector — WissEl: Version of WissEl's data acquisition system built around the RiKon-5 CEMS detector rather than a transmission proportional counter, so that conversion electron Mossbauer spectra can be recorded. The chain runs from the detector through the PEA-6A preamplifier and amplifier and the AMP-1000 main amplifier into the CMCA-550 acquisition module.
• MDAS-3TT Data Acquisition System with CEMS Detector and Low Temperature Equipment — WissEl: Low temperature CEMS acquisition system supplied with the RiKon-5TT detector assembly, which brings a polyethylene foam cryostat and a temperature controller with it. The vertical geometry needed for low temperature CEMS work is provided by the MB-500 VT vertical track included in the package. Signal processing runs through the PEA-6 preamplifier and AMP-1000 main amplifier into the CMCA-550 acquisition module.
• RiKon-5-LNC Liquid Nitrogen Cryostat — WissEl: Liquid nitrogen cryostat that surrounds the RiKon-5 CEMS detector with a nitrogen chamber walled in cellular material. If the detector is not heated the nitrogen charge lasts several hours, and a level sensor can be fitted for automatic refilling. Gamma radiation enters through a window in the bottom and reaches the detector after passing only a short distance of foam plastic, while gas and high voltage are fed in through openings in the top cover.
• RiKon-5-LNC Controller 772 Temperature and Liquid Nitrogen Controller — WissEl: Controller that governs the nitrogen level in the RiKon-5-LNC liquid nitrogen cryostat and manages the supply of liquid nitrogen to it. An AA118 germanium diode serves as level sensor and a PT100 thermo resistor inside the RiKon-5 CEMS detector as temperature sensor, giving a working span from close to liquid nitrogen temperature up to roughly room temperature. A built-in EUROTHERM 3216 module carries the temperature control functions, set from push buttons on the front panel or read and adjusted remotely over the RS 232C serial interface with optional software. Filling status is shown on a three colour LED and an adjusting screw sets the maximum permitted nitrogen transfer time before the alarm trips.
• RiKon-5TT CEMS Detector with Polyethylene Foam Cryostat and Accessories — WissEl: Low temperature CEMS detector assembly listed on WissEl's instrument list as the RiKon-5 detector together with a polyethylene foam cryostat and accessories. WissEl's MDAS-3TT entry adds that the RiKon-5TT package includes the foam cryostat and a temperature controller. It is the detector supplied with the MDAS-3TT low temperature data acquisition system.

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