The eventual outcome is that infrared spectroscopy can provide a unique, label free tool for studying molecular composition and dynamics [1]. Sign in to download hi-res image Fig. 1. The common bond motions around a carbon centre associated with discrete IR. Quantitative spectroscopy is based ...
Ultrasensitive DCS has been demonstrated using hollow-core fibers7, multi-pass cells8, and optical resonance cavities9,10,11. Among these demonstrations, cavity-enhanced schemes, with unmatched pathlength enhancement, yield the lowest detection limits — possibly down to the parts-per-trillion (ppt)...
Sign in to download full-size image Fig. 5. Energy dispersive X-ray spectroscopy.Modified from Chemical Enginnering Department, Hacettepe University, Turkey. Available from: http://yunus.hacettepe.edu.tr/~selis/teaching/WEBkmu396/ppt/Presentations2010/EDXandWDX.pdf; 2017 [accessed 01.11.17]. Vie...
High line density free-standing transmission gratings for EUV and VUV emission spectroscopy - (PPT)We have presented the design and fabrication process for high line density transmission gratings. We demonstrated reproducible pattern definition by UV-NIL and etch mask fabrication by lift-off. We have...
Most of the volume fractions of these trace gases are on the order of some ppb (parts per billion: 1:109) down to several ppt (parts per trillion: 1:1012). This shows the need for ultra sensitive analytical methods for the in-vivo monitoring of human breath, which helps to understand ...
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Table 1. Experimental Δ𝑔Δg values (ppt) of the Cu(II) complexes 1–18 studied in this work. Molecular structures of the complexes are shown in Figure 1. The complexes are arranged in groups according to the copper-coordinating atoms for each subgroup, which are also shown for convenien...
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However, for the nitrogen-based explosives, the concentrations of evaporated molecules are only in the range of ppb to ppt level because of the very low vapor pressure [125]. It is extremely difficult to directly detect this type of explosives. This difficulty can be circumvented by the ...