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Nuclear Magnetic Resonance Apparatus
Nuclear Magnetic Resonance Apparatus


 
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Nuclear Magnetic Resonance Apparatus
Our Price: $8,200.00


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Product Code: 2484
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Description
 
PLEASE NOTE: Advanced Physics Equipment is built-upon-order. We do not stock these items in house, but order them built when an order is placed. Build orders take approximately 90 days.

• Demonstrate the basic phenomena of nuclear
magnetic resonance

• Measure the nuclear magnetic moments of hydrogen
and fluorine

• Determine gyromagnetic ratios

The NMR Apparatus is a set of equipment for introducing students to the basic phenomena of nuclear magnetic resonance using the CW (continuous wave) technique. It allows the hydrogen proton resonance to be observed in six different chemical environments. A fluoride sample also permits the fluorine resonance to be observed and compared to the hydrogen values.

Further investigations allow the nuclear magnetic moments of the hydrogen proton and the fluorine nucleus to be measured and the use of NMR for the precise determination of magnetic fields to be demonstrated. If a gaussmeter is available, values for the gyromagnetic ratios of hydrogen and fluorine can be independently determined.

The apparatus set includes a large permanent magnet with flat pole pieces and soft iron pads. The field strength at the center of the gap is about 0.5T. The exact value is marked on each unit. Helmholtz coils surround the pole pieces. A scan control unit supplies an adjustable ac signal to the Helmholtz coils to scan the “fixed” magnetic field over a narrow range.

The samples, contained in small plastic vials, are placed inside the coil of an RF boundary oscillator. The coil is mounted in the end of a long shielded tube positioned at the center of the permanent magnet’s air gap.

An oscillator control unit carries coarse and fine frequency adjustments and produces an RF signal of very high frequency stability which is measured by an included frequency counter. At a certain RF frequency determined by the nuclear species present in the sample and the strength of the fixed magnetic field, the magnetic moments of the nuclei in the sample resonate with the fields and absorb energy from the RF oscillator by quantum transitions of the nuclear magnetic moment. This causes a large change of the oscillator’s amplitude, which can be observed on a user-supplied oscilloscope.

Five aqueous samples are included; copper sulfate, ferric chloride, hydrofluoric acid, pure water, and manganese sulfate. A glycerin sample is also provided.

Specifications

Magnet module: Permanent magnet with flat soft iron pole pads, air gap 16.5mm
Field strength: Approximately 0.5 T, exact value marked on magnet
Field uniformity: Better than 0.1% over central region
Scan coils: Helmholtz arrangement, 300 turns each, 0.15mA—200mA
Dimensions: 18 x 15 x 26cm
Weight: 24.7 kg

Scan Control Unit: Provides power to the scan coils and oscillator unit, provides scan output to the oscilloscope with
amplitude and phase adjustment.
Scan frequency: 60 Hz. Oscilloscope output:
Amplitude 0—19Vp-p Phase adjustment ±90°.
Power: 115 VAC/60 Hz
Dimensions: 24.5 x 12 x 20cm
Weight: 2.3 kg

Oscillator Unit: RF boundary oscillator with probe coil, range 15.8 MHz—24.6 MHz
Dimensions: 24.5 x 21 x 10.5cm

Weights: Oscillator unit: 2.3 kg, probe: 113 g

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