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ESR Inventory

FT-EPR_demo_movies: Part A Part B

I. ESP 380 E

System includes the following components:

  1. ESP 300 console

  2. ER 073 10" Magnet

  3. ESP 380-1010 FT Microwave Bridge (Gunn source).

  4. ER 082 7 kW Power Supply (for magnet and console)

  5. ER 090 7kW Heat Exchanger (for magnet, power supply and bridge)

  6. ER 201 X-Y Analog Recorder ("chart recorder")

  7. ER 023M Superheterodyne microprocessor based modulation/detection channel ("signal channel"). Doesn't work for modulation amplitudes ca. < 0.4 G.

  8. ER 032M Microprocessor based field controller

  9. Data system: ESP 3220 computer with the following boards (on a VME bus):

    • GIP ESP 1600-1024

    • CPU ESP 1600-1014 Motorola 68040 CPU, 8MB RAM, ethernet.

    • GCP ESP 1600-1023

    • HGP ESP 1600-1022 Graphics board

    • MBC ESP 1600-1048 Microwave bridge control board

    • ADF ESP 1600-1072 Transient recorder

    • SDI ESP 1600-1078 Fast digitizer used for FT experiments

    • GSI ESP 1600-1030

    • SIP ESP 1600-1005

    • PSU ESP 1600-1128 Power supply for all these boards

    • 2GB hard drive

    • Software: OS/9 v. 3.0, ESP 380E v. 3.04


FT Components:

  1. ESP 380-1020 Controller

  2. ESP 385 Pulse Programmer with the following boards: power supply, interface, time base, 8 pulse channels (note: controller+pulse programmer together on a special console).

  3. Traveling wave tube (TWT) Amplifier from ASE (Applied Systems Engineering)

  4. Two flow cell for low-Q dielectric resonator and two flow cell which can be used together with Helium Cryostat


Variable Temperature:

  1. ER 4118CF-W1 Helium Cryostat with rectangular bottom, optical window, and holder assembly, for the low-Q dielectric resonator (mainly for FT applications). Note: this cryostat CANNOT be used with liquid nitrogen. Has following parts:

    • He pump (MFG Corp., Benton Harbor, Mich., Model DOA-U192-AA, 4.2A, 115V, 60 Hz) with flow display.

    • Oxford Instruments ITC 4 temperature controller

    • He transfer line, with manual needle valve.

    • ** Need Safety Check Valve (Ralph Weber is sending us one).

      ** Need new and spare windows (ordered from Oxford Cryostats).

  2. ER 4118CV-M Metal, liquid nitrogen dewar for the low-Q dielectric resonator (mainly for FT applications). Also provides RF shielding for FT applications when VT is not used. Does not have optical windows. Can be used up to 40-50 deg. C max.

  3. ER 4112HV Helium Cryostat, to be used with standard (ER 4102ST) and flat cell (ER 4103TM) resonators. Note: we have the old version which CANNOT be used with liquid nitrogen (type CS 45769). To be used with the Oxford Instruments ITC 4 temperature controller above.

  4. ER 4111VT Liquid nitrogen VT system (ca. 150C to ca 50C with current resonators, up 700C with special high temperature resonator) with:

    • ER 4111VT Temperature Control Unit

    • 10 liter glass dewar, quartz transfer line, liq. nitrogen boiler, nitrogen gas heater.

    • Suprasil dewar inserts for standard (ER 4102ST) and flat cell (ER 4103TM) resonators. Also special suprasil dewar insert to be used for high temperature applications to prevent cavity heating.

  5. Suprasil liquid nitrogen finger dewar flasks (2), from Wilmad Glass, Buena, NJ. (WG-853-B-Q Large 150m suprasil finger dewar flask).



  1. Standard Cavity ER 4102ST (TE102 mode) with grids for optical access.

  2. Flat cell cavity ER 4103TM (TM110 mode) with larger grids for optical access.

  3. Flexline low Q dielectric resonator (ER 4118). Mainly for FT applications, but can also be used for CW. Has grids for optical access.



Includes the following:

  1. ER 070 6" magnet

  2. ER080 1 kW Power Supply

  3. EMX 090 1kW Heat Exchanger

  4. ER 041XG Microwave X-Band solid state bridge (Gunn Source)

  5. EMX 113 system console with system power supply and cabling

  6. E 027T Signal Channel Base Station, accomodating up to 4 Signal Channel Modules, including power amplifier.

  7. E 027SCT-H Signal Channel Module, 6kHz to 100 kHz

  8. E 032T Hall Field Controller (100G to 16kG)

  9. E 040-1043 Automatic Iris Tuning system

  10. E 048 Bridge controller

  11. EMX PC Personal Computer (Micron), fit with a Transputer High Speed Interface to Spectrometer devices. With Epson Stylus 600 Color Inkjet printer, 17" color display, windows 95 operating system.

    ** PC not on ethernet!?

  12. EMX 1082 EPR software package including WIN-ACQ (windows based acquisition program)


Variable Temperature:

  1. ER 4131VT N2 Variable temperature system, with digital controller, dewar reservoir, heater, boiler. Note: this system is incompatible with the ER4111VT system above (except for the dewar inserts).

  2. VT accessories for the ESP 380E can be used with the EMX, except ER 4131VT above must be used instead of ER4111VT for boiling liquid N2 VT applications.


Resonators for EMX:

  1. ER 4102ST standard cavity. Note: this one has a tuning box to allow use with the other EPRs.

  2. Note: all the cavities listed for the other EPRs can be used interchangeably, provided proper calibration is made.


Items related to ESP 380E and the EMX:

  1. A Micron PC used for data backup (via ethernet connection to ESP380E) and EPR data analysis and simulation using Win-EPR and Simfonia.

  2. Electrochemical cell (wilmad WG 810) with equipments and potential generator (pine instrument company)


III. ESP 300 (Replaced Bruker ER 100D and Varian E-4)


Used for time resolved EPR as well as simple CW EPR.

Consists of:

  1. ER 041MR Microwave Bridge (Klystron source). Fit with fast, broadband preamplifier (ER 047PH) especially for TR-EPR.

  2. ER 048H Microwave Controller

  3. ESP 300 console.

  4. ER 003 Display (oscilloscope to see the tune mode picture).

  5. ER 023M Signal Channel (same as the one on ESP 380E).

  6. ER 032M Field Controller (same as the one on ESP 380E).

  7. ER 080 (60/20 C5) Magnet Power supply

  8. X-Y Analog Recorder (chart recorder)

  9. Tiny magnet (4"). Cooled with tap water.

  10. Homemade table for microwave bridge and Boxcar. Stabilizes against vibrations. Also allows Iris Motor to be connected for remote tuning (using the ER 048H microwave controller).

  11. Data system: ESP 1600-SI computer (Nr. 87-DSC 181) with the following boards:

    • CPU ESP 1600-1012 Motorola 68020 CPU, no ethernet.

    • GSI ESP 1600-1030

    • ADC ESP 1600-1070 Transient recorder

    • GDP ESP 1600-1020

    • SIP ESP 1600-1005

    • SASI ESP 1600-1006

    • Software: OS/9 operating system, ESP 300 v. 3.02 (1993) data acquisition/manipulation software.



HP 7475A plotter.


TR-EPR components:

  1. EG&G PAR Model 4420 Boxcar Averager with 2 model 4422 Gated Integrator Channels.

  2. EG&G PAR Model 4402 Signal Processor.

  3. Photodiode to trigger boxcar

  4. Two syringe pumps to flow solutions

  5. Tektronix Model (TDS360) Transient digitizer to record time-domain signals at fixed magnetic field.



  1. New ER 4101 STE standard cavity. Note this one is narrower than the other standard cavities we have, to be used with the small magnet of the ESP 300.

  2. ER 4103 TME/8123 flat cell cavity. Note: has significant background signal, which does not matter in TR experiments (low frequencies are cut off) but may be important for CW experiments.