Abstract
The electronic structure of TEMPO (2,2,6,6-tetramethyl-1-piperidinyl N-oxide), its cation and anion were studied experimentally using the following electron spectroscopy techniques: electron energy-loss spec-troscopy (EELS), measurement of elastic and vibrational excitation (VE) cross sections, HeI photoelectron (PE) spectroscopy and dissociative electron attachment (DEA) spectroscopy.
Highlights
The study of processes induced by electron collisions with radicals in general is motivated by the copious presence of the latter as transient species in natural and technological plasmas
We report a study of the electronic structure of TEMPO and of its cation and anion, and its electron-induced fragmentation, by the electron spectroscopy techniques, dissociative electron attachment (DEA) spectroscopy, electron energy-loss (EEL) spectroscopy, measurement of elastic and vibrational excitation (VE) cross sections, and HeI photoelectron spectroscopy
We present a chemical change induced by free electrons, for whose understanding the above spectroscopic information will prove helpful
Summary
The study of processes induced by electron collisions with radicals in general is motivated by the copious presence of the latter as transient species in natural and technological plasmas. An alternative method of learning about general principles which may be present in electron-induced processes in radicals is to use stable radicals like NO [2]. The main purpose of the present work is to adopt this strategy using another stable radical, the TEMPO (2,2,6,6-TetramethylpiperidineN-oxyl) molecule, as a target. Additional motivation for the present study stems from the diverse uses of the TEMPO moiety in many areas of research. The recently emerged organic radical battery [6,7] is based on the reversible electrochemical oxidation–reduction of TEMPO and similar nitroxides [8,9]. TEMPO-induced electron transfer quenching of fluorescence may lead to
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