Moleküllumineszenzspektroskopie

Suppressor and calibration standard limitations in cation chromatography of ammonium and 10 alkylamines in atmospheric samples

“…48 Theoretical plate height is directly proportional to the diameter of stationary phase particles (2 d p + d p 2 ); therefore, it was expected H should decrease by a factor of 1.7. 66 Improvement in theoretical plate number was observed for most of the analytes (9 out of 16): six inorganic cations, MEtAH + , DMAH + , and TEAH + . For example, the H value of NH 4 + was calculated from our method using (E4) as 0.11 mm using the 4 μm packing, a decrease in H by a factor of 1.4 compared to the value of 0.15 mm using the 5.5 μm packing.where L is the column length (mm).…”

Photochemistry of 2-Iodobenzothiazole and Iodine-Triggered 2-Isocyanophenylthiyl Radical Cyclization in Argon Matrices

“…The origin of the wavy nature of the baseline can be attributed to the interference fringes due to the interaction between the infrared light and the thin film of the matrix formed on the cold target (KBr substrate) that forms constructive and destructive interference patterns. The interference fringes can be helpful in deducing the thickness of the matrix formed using the formula given below normalt normalh normali normalc normalk normaln normale normals normals .25em normalo normalf .25em normalt normalh normale .25em normalm normala normalt normalr normali normalx , b = normalΔ N 2 ( υ̅ 1 − υ̅ 2 ) where Δ N = No of interference fringes bold-italicυ̅ 1 .25em normala normaln normald .25em bold-italicυ̅ 2 are the initial and final positions of the selected interference fringe in wavenumber …”

Vibrational spectroscopy as a probe of heterogeneities within geochemical thin films on macro, micro, and nanoscales

“…Micro-Raman spectroscopy measures the amount of scattered light from a sample and is often used for mineral identification. 47,48 While infrared allowed vibrational modes are a result of a change in dipole, Raman scattering occurs for vibrational modes that result in a change in polarizability, α , which leads to an induced dipole, as shown in eqn (4), 49,50 μ ind = αε ,where ε refers to the electric field that is driven by light and the resulting induced dipole, μ ind .…”