Articles

Proton transfer reaction mass spectrometry

MS-24-6-F3-sThere are many reasons for quantifying VOCs in air, from investigating pollution to diagnosis of diseases in humans. PTR-MS has many advantages for this, not least in speed and ability to provide an online analysis. It is a relatively young technique, but has a range of applications from botany and medicine through to industrial process monitoring, security screening, environmental analysis and food science.

Read more: Proton transfer reaction mass spectrometry

 

Representative Raman measurements of carbon nanotubes

Raman-24-6-F1-sThis article explains what is represented in a Raman spectrum of carbon nanotubes and how to optimise the measurement. There is actually significant diversity within samples of nanotubes which affects both the material properties and the Raman spectrum of the material.

Read more: Representative Raman measurements of carbon nanotubes

   

The application of isotope ratio mass spectrometry to the study of the ecophysiology of plant seeds

The use of isotope ratio mass spectrometry is on the rise, with more papers published and more labs with the facilities. The authors describe the main IRMS studies conducted on seeds and isotopes and outline the most important aspects of the use of seeds to study plant eco-geochemistry and plant material traceability.

Read more: The application of isotope ratio mass spectrometry to the study of the ecophysiology of plant seeds

   

Single particle characterisation in biologics: from mid-infrared micro-spectroscopy and mapping to spectral imaging

IR-25-1-F4-sThe presence of “particles” in protein pharmaceuticals (biologics) can cause severe, unwanted effects in the drug. The article describes the use of mid-infrared micro-spectroscopy for the investigation and chemical characterisation of single particles in these biologics.

Read more: Single particle characterisation in biologics: from mid-infrared micro-spectroscopy and mapping to spectral imaging

   

Time-resolved X-ray absorption spectroscopy

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How a cat manages to turn and land on its feet may not be the most obvious start to an article in Spectroscopy Europe. However, C.J. Milne and M. Chergui use the example in their article on “Time-resolved X-ray absorption spectroscopy” to show how the time dimension is important in many analyses and applications. There has been a real surge in time-resolved X-ray absorption ­studies in chemistry, biology and materials science. Picosecond time resolution is routinely achieved and femtosecond resolution has been demonstrated at synchrotrons, albeit at the cost of a significantly reduced photon flux. However, the advent of hard X-ray-free electron lasers offer the promise of making such studies routine.

Read more: Time-resolved X-ray absorption spectroscopy

   

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