Patent ID: 7659124

Claim:
A method for at least one of detection or analysis of a test compound or object that may contain a compound bearing spin A nuclei having a quadrupolar resonance frequency and capable of exhibiting a quadrupolar resonance; and spin B nuclei having a magnetic resonance frequency and capable of exhibiting a magnetic resonance, said method comprising: a) radiating the test compound or object with a first magnetic field H 1 oscillating in the quadrupolar resonance frequency of the spin A nuclei in an excitation pulse sequence comprising a first high frequency pulse of π/2 and; a second weak magnetic field H 0 in a second pulse sequence that is turned on at the same time as the first high frequency pulse of said magnetic field H 1 ; and a third magnetic field H 2 oscillating within the magnetic resonance frequency of said spin B nuclei in said magnetic field H 0 ; b) turning said second magnetic field H 0 off when a signal of quadrupolar resonance from said spin A nuclei is maximal and then detecting signals with a receiver; c) digitizing and summing detected signals while said second magnetic field H 0 is off; d) turning said second magnetic field H 0 on again once the digitizing step ends; and e) repeating steps b) to d) to increase the signal-to-noise ratio and then analyzing the digitized and summed signals for the nuclear quadrupolar resonance of the compound.