Electron capture spectroscopy

It remains, however, the question whether Tb(0001) exhibits an enhanced Ten as claimed by Rau et al. [124] on the basis of electron capture spectroscopy (ECS). The results of this study show that the electron spin polarization remains non-zero... 

EC = electrical conductivity detector ECD = electron capture detector FPD = flame photometric detector GC = gas chromatography HPLC = high performance liquid chromatography NPD = nitrogen phosphorus detector TID = thermionic detector UV = ultraviolet spectroscopy... 

As a test case, we report in this paper the study of the -t- He collision. This work has been undertaken in connection with photon spectroscopy experiments regarding the electron capture for the reactions... 

The nuclear decay of radioactive atoms embedded in a host is known to lead to various chemical and physical after effects such as redox processes, bond rupture, and the formation of metastable states [46], A very successful way of investigating such after effects in solid material exploits the Mossbauer effect and has been termed Mossbauer Emission Spectroscopy (MES) or Mossbauer source experiments [47, 48]. For instance, the electron capture (EC) decay of Co to Fe, denoted Co(EC) Fe, in cobalt- or iron-containing compormds has been widely explored. In such MES experiments, the compormd tmder study is usually labeled with Co and then used as the Mossbauer source versus a single-line absorber material such as K4[Fe(CN)6]. The recorded spectrum yields information on the chemical state of the nucleogenic Fe at ca. 10 s, which is approximately the lifetime of the 14.4 keV metastable nuclear state of Fe after nuclear decay. 

Some examples of specific electron-capture by various organo-metallic compounds in such solvents are summarised in reactions [5]-[10] [refs. (5)-(H)) respectively]. In some cases, the parent anion ( AB ) is detected by e.s.r. spectroscopy, but in others subsequent reactions have occurred. 

AgN03 = silver nitrate CICN = cyanogen chloride CN" = cyanide ion CNATC = cyanides not amenable to chlorination (Rosentreter and Skogerboe 1992) AAS = atomic absorption spectroscopy EPA = Environmental Protection Agency FIA = flow injection analysis GC/ECD = gas chromatograph/electron capture detector HCN = hydrogen cyanide NaOH = sodium hydroxide NIOSH = National Institute for Occupational Safety and Health... 

Pleil JD, Oliver KD, McClenny WA. 1988. Ambient air analyses using nonspecific flame ionization and electron capture detection compared to specific detection by mass spectroscopy. JAPCA 38 1006-1010. 

Low-energy electron impact spectroscopy of [l.l.l]propellane reveals an unusually low energy for electron capture to form the radical anion (2.04 eV compared to about 6 eV for most alkanes) ... 

Many analytes listed in Table 1 have been measured spectrophotometri-cally in seawater for some time, including many metal ions and some gases, although spectrophotometry is the preferred method for only a minority. Some analytes, like alkanes, are spectrophotometrically silent, or do not form colored complexes with other reagents. Similarly, individual nuclides cannot be distinguished by classical spectrophotometry, and many of the other analytes, such as halogenated pesticides and metal alkyls, are more easily determined by other methods, such as gas chromatography with electron capture detection, or emission spectroscopy. Indeed, many of the analytes, such as zinc or copper, are present at trace levels and are not measurable by spectrophotometry. 

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