UMass-Amherst Electron Paramagnetic Resonance Facility

Electron Paramagnetic Resonance Facility at UMass-Amherst

Facility Home Page

Facility Introduction

E-500-10/12 electron paramagnetic resonance spectrometer system
     ER 049SX SuperX Gunn diode bridge (60 dB) for X-band with built in frequency meter (up to 10 GHz)
     ER 051QG Gunn diode Q-band bridge (60 dB)
     HP 5352B frequency counter (up to 40 GHz) connected to Q-band bridge
     E-036TM NMR type teslameter
     ER 073 magnet, 10" poles (14.5 kG) and pole cap tips for higher field (17 kG) Q-band measurements
     ER 081 12 kW power supply
     ER 091 12 kW heat exchanger
     E-513S single door console linking bridge, computer, and power units
     ER 4112HV-1021 CERNOX temperature sensor

Linux-based PC data system
     Pentium PC
     512 MB memory
     40 GByte system disk
     Ethernet (external and direct to spectrometer console; firewalled)
     17-inch flat panel monitor
     Epson inkjet type color printer

Cavities available
     ER 4105DR TE-mode double cavity, usually equipped with nitrogen VT system X-band
     ER 4116DM dual mode TE102/TE012 single cavity, X-band
     ER 4122-SHQE high sens TE102 cylindrical mode single cavity (Q ~ 3000) optical window, X-band
     ER 4102 single cavity, rectangular mode (legacy from original system), with optical waveguide, X-band
     ER 4105DR double cavity, rectangular mode (legacy from original system), X-band
     ER 5106QT-W Q-band resonator equpped with LHe cryostat and optical window

Variable Temperature Capabilities
     Oxford instruments EPR-9000 LHe/LN2 flow cryostat for use with X-band (4.2-300 K)
     Bruker ER 4131 nitrogen flow insert with effective range of 120-475 K for use with X-band
     Bruker ER 4118CF-O LHe/LN2 flow cryostat for use with Q-band (4.2-300 K)

Spectral Simulation
Full xSophe license (must be run on the Linux system)
Simfonia and WinEPR software for spectral workup, manipulation (Windows only, see PML for access)

Photochemistry capability
The facility has Kratos 1000 W xenon arc lamp with focusing lenses attachable to a 7 mm liquid light pipe, three 3-meter fiber optic cables with SMA connectors, various glass cut-off and band-pass filters, some notch (narrow band-pass) filters, and a monochromator. The resonators above that are described as having optical windows allow in situ photolysis; this can be combined with variable temperature capability in the ER 4116DM, ER 4122-SHQE, ER 4102, and ER 5106QT-W resonators. The facility also has a Bruker E600-1021RL sample stick that allows in situ photolysis in the Q-band resonator (fiber optic line goes down the sample stick).