In previous works we applied this technology to monitor CO2 and H2O in volcanic fumaroles, using a dual-wavelength approach [17], delivering a beam with 1.57 and 1.39 μm diode-laser radiation to a 20-cm-long cell placed upon the emitting fumarole by means of optical fibers.
Dependant upon the emitted wavelength, the delivery system may be a quartz fibre-optic, a flexible hollow waveguide, an articulated arm (incorporating mirrors), or a hand-piece containing the laser unit (at present only for low-powered lasers).
Excited-state CH radicals (A2Δ → X2Π, denoted CH*), upon relaxing, emit a photon in the visible portion of the electromagnetic spectrum, giving what is seen as a faint blue glow.
The strategy being adopted by Heathrow management depends upon new diesel engines emitting less pollutants than current models, but this strategy is doomed to failure as recent studies demonstrate that even Euro 6 diesel engines emit much more NO2 on the road than they do in lab testing.
Autofluorescence and radioluminescence The tissue itself also plays the role of a contrast agent by naturally emitting luminescence upon external excitation.
Titanium becomes radioactive upon bombardment with deuterons, emitting mainly positrons and hard gamma rays.
The cationic dye JC-1 accumulates and aggregates in intact mitochondria, emitting a bright red fluorescence, whereas, upon disruption of the mitochondrial membrane potential, the monomeric dye emits green fluorescence in the cytoplasm.
As mentioned above, depending on the Δψm, JC-1 accumulates selectively within intact mitochondria to form J-aggregates emitting fluorescence light at 585 nm, and the J-monomer emits at 530 nm upon excitation with 488 nm light.
Vocalizations are birdlike, and these sharp whistling calls are emitted upon the approach of predators.
