@Article{Tol_etal2005,
author="Tol, J. van
and Brunel, L-C
and Wylde, R. J.",
title="A quasioptical transient electron spin resonance spectrometer operating at 120 and 240 GHz",
journal="Rev. Sci. Instrum.",
year="2005",
volume="76",
number="7",
pages="074101 (1 to 8)",
optkeywords="Schottky; noise temperature",
abstract="A new multifrequency quasioptical electron paramagnetic resonance (EPR) spectrometer is described. The superheterodyne design with Schottky diode mixer/detectors enables fast detection with subnanosecond time resolution. Optical access makes it suitable for transient EPR (TR-EPR) at 120 and 240 GHz. These high frequencies allow for an accurate determination of small g-tensor anisotropies as are encountered in excited triplet states of organic molecules like porphyrins and fullerenes. The measured concentration sensitivity for continuous-wave (cw) EPR at 240 GHz and at room temperature without cavity is 1013  spins/cm3 (15 nM) for a 1 mT linewidth and a 1 Hz bandwidth. With a Fabry-Perot cavity and a sample volume of 30 nl, the sensitivity at 240 GHz corresponds to [approximate]3{\texttimes}109 spins for a 1 mT linewidth. The spectrometer{\textquoteright}s performance is illustrated with applications of transient EPR of excited triplet states of organic molecules, as well as cw EPR of nitroxide reference systems and a thin film of a colossal magnetoresistance material.",
optnote="Actually, noise spectral density is given (3e-19 W/Hz)",
optnote="exported from refbase (https://db.rplab.ru/refbase/show.php?record=588), last updated on Tue, 25 May 2021 21:22:10 -0500"
}