CWS 12-50 SPECTROMETER SPECIFICATIONS

Mode NMR (1H, 19F), ESR
Operational Frequency NMR 1H-13 MHz, NMR 19F-12.2 MHz, ESR-50 MHz
Frequency Stability ≤ 1 PPM/ 1h
Electromagnet  
    - magnetic field 300 mT
    - maximum current 0.7A
    - coil 2,000 turns
    - gap 10.5 mm
    - pole diameter 50 mm
    - homogeneity ≤ 10-4/sample volume
    - field stability ≤ 10 μT/1 hr
Helmholtz Coils  
    - magnetic field 195 μT
    - gap 15 mm
    - coils diameter 70 mm
    - homogeneity 10-5/sample volume
Modulation Field  
    - frequency 38 Hz
    - amplitude 0.1-20 μT
Sweep of Magnetic Field (NMR and ESR)  
    - range 0.5 mT - 10.0 mT
    - time 0.5 min - 30 min
Sweep of Frequency (only NMR)  
    - range 20 Hz - 400 kHz
    - time 0.5 min - 30 min
RF Probehead  
    - solenoid coil dimensions ID=5.8 mm; L=10 mm
    - mode Automatically tuned for NMR or ESR
Receiver  
    - gain 0-48 dB (2 dB step)
    - detection phase-sensitive
    - phase adjustment 0-360°, step 1.5°
    - signal filter sweep controlled
    - DC offset converter automatic
A/D Converter  
    - resolution 10 bit
    - number of samples Min 512 per sweep
Weight and dimensions WxDxH  
    - electronic unit 3.5 kg, 350x135x85 mm
    - probehead 0.4 kg, 35x210x70 mm
    - Helmholtz coils (ESR) 0.5 kg, 50x80x110 mm
    - electromagnet (NMR) 10.5 kg, 175x100x160 mm
Power Consumption 110V/220 V; 50/60 Hz; 40 W
Communication Port two way RS 232C
Computer Required IBM PC, min 750 MHz, VGA color or compatible
Software MS Windows operated


SAMPLES

NMR Sample Nuclei
  H2O + CuSO4 1H
  Rubber 1H
  Acrylic 1H
  Delrin 1H
  HBF4 1H and 19F
  Teflon 19F
 
ESR Sample (free radicals)
  TCNQ
DPPH


SPECTROMETER

Operation:

Recording of NMR and ESR spectra

From recorded spectra one can determine:

1. Second moment
2. Line width
3. g factor
4. Line shape
5. Earth magnetic field magnitude
6. Accurate value of the magnetic field in electromagnet and Helmholtz coil


COMPONENT DETAIL