Model: EMX PLUS 10/12 (Electron-Spin Resonance Spectrometer Systemwith 10" Magnet and 12 KW Power Supply)

Digital Ultra High Resolution Hall Field Controller
Microwave Bridge: Type EMX-m40X(X-band)
Source: solid state microwave source;
Frequency range: 9,3 to 9,9 GHz
low noise: -130dBc/ 100 kHz from carrier
maximum source output : 200mW
phase sensitive detection
integrated frequency counter with 1 kHz resolution

Frequency Tuning:
tune bandwidth: 8 MHz,
suitable for standard resonator types
Automatic Frequency Control(AFC):
AFC lock range: 4 MHz
digital adjustment for modulation amplitude and gain
AFC stability: 10-8

Microwave Power Setting:
Attenuation : 60dB max
automatic phase correction over attenuation range,

Microwave Reference Arm:
Reference Arm with microwave attenuation and phase shifter,

Signal Amplifier: low noise preamplifier,
20 Hz to 600 kHz,
two 50 Ohm signal outputs

Resonator Tuning and Matching:
the system features "auto tuning" and "auto matching"
for most probeheads via iris

Q-factor Display:
the system evaluates the probehead (resonator) and
displays the loaded Q-Factor.
All parameters of the bridge are software controlled

High Sensitivity Probe (Type 2)
with optical window for CW-EPR in X-Band:

• 10 mm sample access
• 20 G maximum modulation amplitude
• automatic cavity matching
• forlossy and non-lossy samples
• compatible with ER 4131VT and ER 4112HV
• unloaded Q > 15.000
• Sensitivity: Weak Pitch 1200 : 1 Absolute 2.5 x 109 spins / G

Q-Band Microwave Bridge with frequency counter
microwave source: Gunn
Operating frequency: 34 GHz
max. Power: 100 mW
operating range: 100 MHz
attenautaion precision: +/- 0.2dB
attenuation resolution: 1 dB
attenuation max.: 60 dB
Signal bandwidth: 30 Hz to 400 kHz
Integrated frequency counter with 1 kHz resolution

ER 5106QT
Cavity for room-, nitrogen, helium temperatures (X-band)

Helium Cryostat, 3.8 K to 300 K (Q-band)
with 5 mm optical window,compatible with ER 4112HV-1020 control system(including cryostat holder), used for Flexline,K- and Q-Band resonators.

ER 5106QT
Electrolytic cell assembly (X-band)
Single crystal EPR measurement One axis Goniometer

• EPR spectrumcan be recorded for solid and in solution phase.
• Variable temperature EPR measurement can be performed from room temperature upto 5.0 K in both X-band and Q-band.
• In-situ generated radicals (by electrolytic reduction) can be monitored
• Advanced level single crystal EPR measurements can be performed using the single crystal rotor.

In an EPR experiment the field of the spectrometer magnet is swept linearly to excite some of the electrons in the lower energy level to the upper energy level while the sample is exposed to fixed microwave irradiation. The free or the upaired electrons have a small magnetic field and orient themselves parallel to the larger field produced by the spectrometer's magnet. At a particular magnetic field strength the microwave irradiation will cause some of the free electrons to "flip" and orient against the spectrometer's magnetic field. This separation between the lower and the higher energy level is exactly matched by our microwave frequency. The condition where the magnetic field and the microwave frequency are "just right" to produce an EPR resonance (or absorption) is known as the resonance condition is detected by the spectrometer.
 

• For X-band:
  • Minimum 40-50 mg sample is needed for solid state measurement
  • For solution state measurement 1 x 10^-2 M (provide the preferable solvent to dissolve your sample (avoid using highly polar solvent for measurement))
• For Q-band:
  • Minimum 5-20 mg sample is needed for solid state measurement
  • For solution state measurement 1 x 10^-3 M (provide the preferable solvent to dissolve your sample (avoid using highly polar solvent for measurement))

• Registered user will be allotted time as per queue.
• User should submit the samples to the EPR lab between 9:30 AM and 11:00 AM on the scheduled day.
• Samples will be loaded in to the system on the submitted day and analysis will be carried out after 4 to 6 hours or on the next day. Data will be sent through email.

• Internal users can register online.
• External users need to down load registration form and submit it to lab along with the requisite demand draft. The samples should be submitted personally on the day of allotted time slot. Analysis will be performed on the next day and results will be sent through email.
• Getting back the samples: Users desiring to get back the samples need to mark on the form. Collect them from the lab between 9:30 AM to 11:00 AM after two-three days of completion of the work (intimated through mail) and uncollected samples will be disposed off after ten days of intimation of the completion of the work and no reminders will be sent.