Electron Spin Resonance Apparatus
AssigneeJEOL Ltd.
InventorTakayuki Suzuki
Life of this patent
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Abstract
A pulse pattern forming a pulse sequence is repeatedly generated according to a repetition frequency Fp, and an original pulse train is generated. A modulation signal which repeats ON and OFF states at a modulation frequency Fm is generated. Fp and Fm are in a relationship Fp=2n×Fm, wherein n is an integer greater than or equal to 1. The original pulse train is modulated according to the modulation frequency Fm, and a pulse train signal is generated. A microwave signal is modulated by the pulse train signal and is supplied to an electron spin resonance chamber. By executing a lock-in demodulation on a detection signal reflecting electron spin resonance using the modulation frequency Fm, an ESR signal is obtained.
Claims7
An electron spin resonance apparatus comprising:
- a microwave generator that generates a microwave signal;
- a pulse train signal generator that generates a pulse train signal according to a modulation frequency Fm and a repetition frequency Fp of a pulse sequence;
- an excitation signal generator that applies the pulse train signal on the microwave signal to generate an excitation signal;
- an electron spin resonance chamber that houses a sample and to which the excitation signal is sent;
- and
- a demodulator that executes a lock-in demodulation using the modulation frequency Fm on a detected signal reflecting electron spin resonance caused in the sample, to generate an analysis target signal, wherein
- the repetition frequency Fp and the modulation frequency Fm are in a relationship Fp=2n×Fm, wherein n is an integer greater than or equal to 1.
An electron spin resonance apparatus comprising:
- a microwave generator that generates a microwave signal;
- a pulse train signal generator that generates a pulse train signal in which a reference pulse train is repeated with a repetition frequency Fp and which is modulated by a modulation signal having a modulation frequency Fm;
- an excitation signal generator that modulates the microwave signal with the pulse train signal to generate an excitation signal;
- an electron spin resonance chamber that houses a sample and to which the excitation signal is supplied;
- a detector that generates a detected signal reflecting electron spin resonance caused in the sample;
- and
- a demodulator that executes a lock-in demodulation on the detected signal based on the modulation signal, to generate an analysis target signal, wherein
- the repetition frequency Fp and the modulation frequency Fm are in a relationship Fp=2n×Fm, wherein n is an integer greater than or equal to 1, and
- the repetition of the reference pulse train and the modulation by the modulation signal are synchronous with each other.
Dependencies are inferred from the claim text.