20 Mass spectrometers for vacuum, gas, plasma and surface science QGA CATLAB-PCS
QGA Gas Analysis System
Fast data acquisition 500 measurements/sec Response time to 150 ms Dynamic range PPB to 100%
Microreactor with integrated MS detector
TPD/TPR/TPO and reaction studies 1-20°C/min heating rates Temperature ramps up to 1000°C Close-coupled hotzone for 500 ms response
W
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Enhancing the Luminescence of Core-Shell Lanthanide-Doped Nanocrystals through Surface Modifi cations
Researchers at the University of California at Berkeley and Lawrence Berkeley National Laboratory, have demonstrated a mechanism that exploits surface quenching processes to magnify the luminescence of core-shell lanthanide-doped nanocrystals, featured in Nano Letters, an ACS Publication. This work, lead authored by Dr Stefan Fischer conducting research under Professor A. Paul Alivisatos, the Samsung Distinguished Chair in Nanoscience and Nanotechnology Research at Berkeley, precisely tuned the shell thickness around upconversion and downconversion b-NaYF4
; Yb, Er nanoparticles with undoped b-NaLuF4
shells to quantify, understand, and enhance the luminescence properties associated with optimising surface quenching through spectral and lifetime analysis. Upconversion and downconversion nanocrystals have been shown for their unique ability to shift wavelengths of light to higher or lower energies based on the lanthanide dopants and crystal host, with broad applications in quantum cutting, securities, biomedical imaging, and novel light emitting diodes, to name a few.
For this study, the researchers exploited an Edinburgh FLS980 Luminescence Spectrometer coupled to an Opotek Opolette laser to acquire spectral and lifetime properties of the enhanced upconversion and downconversion mechanism of these shell-enhanced lanthanide-doped nanocrystals. Dr Stefan Fischer said: “The Edinburgh FLS980 allowed us to look at the time-dependent dynamics of every single transition of Er3+
and Yb3+ in our nanocrystals on a very
reproducible and quantitative level which eventually enabled us to derive surface quenching rates for every energy level involved in the complex up- and downconversion mechanism. This enhanced understanding of the system’s dynamics allowed us to model a novel surface quenching assisted downshifting mechanism with a distinctive peak for a certain thickness of the inert shell. This distinctive peak is a result of the interplay between the different surface quenching rates which we have determined by exploiting the sensitivity of the FLS980 over a abroad spectral range from the UV to the NIR.“
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Diffuse Refl ectance Probe Provides Measurement Consistency The Ocean Optics Diffuse Refl ectance Probe (DR-Probe) measures 45-degree diffuse refl ectance, enhancing UV-Vis and NIR spectroscopy results. This sampling tool removes localised variance in
refl ectance measurements. It is suitable for applications such as colour analysis, material identifi cation and food quality monitoring.
The DR-Probe integrates a light source and collection optics into one unit to measure 45-degree diffuse refl ectance. With the probe’s collection optics fi xed in place relative to the light source, the measurement geometry is constant. An included standoff accessory ensures a consistent 40 mm focal length between the probe and the sample. Sampling uniformity increases the reliability and consistency of measurement results.
The DR-Probe has rugged, all-metal construction for durability in the lab or fi eld. Its 6W tungsten halogen bulb has a 10,000-hour lifetime. Compatible with Ocean Optics Visible and NIR spectrometers and accessories, the DR-Probe integrates seamlessly into experimental setups.
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New Spectrophotometer with Advanced Diode Array Technology Launched Bibby Scientifi c Ltd have announced that Jenway®
, a leading UK manufacturer of analytical laboratory instruments, has launched the new 7200 visible
scanning spectrophotometer. The 7200 has been designed for simple, fast and robust use in routine analysis, research and education laboratories. With its diverse range of measurement modes, it is suitable for many different applications, including food and beverage, quality control and industrial testing. This latest addition to Jenway’s comprehensive range of spectrophotometers leverages advanced diode array technology, which uses electrical scanning to measure the entire wavelength range simultaneously, to provide excellent wavelength reproducibility. As this instrument doesn’t require a traditional stepper motor to move the grating there are no moving parts within the instrument, making it exceptionally robust.
The clever design of
the 7200 spectrophotometer encompasses a large colour touchscreen display and a large sample chamber, with a handy cuvette storage rack, all in a lightweight instrument with a small footprint. Designed to accept current passive accessories, the 7200 spectrophotometer saves customer set up costs. This product will add to Jenway’s existing range of spectrophotometers that are internationally renowned for their manufacturing quality, ensuring robust and reliable data analysis in numerous customer applications.
“Bibby Scientifi c is committed to offering the highest quality products. Our new
7200 visible spectrophotometer with diode array technology will provide laboratories worldwide with a high quality, reliable and analytical instrument,” said Becky Underwood, Product Manager, Bibby Scientifi c.
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