Patent ID: 7989761

Claim:
A gas analyzing method for determining components of a first gas, comprising: a first mass analysis step of measuring an intensity of ion obtained from said first gas through an electro impact ionization process; a second mass analysis step of measuring an intensity of ion obtained through soft ionization process from a second gas having same concentration of components as those of said first gas; a molecular weight determination step of determining molecular weights based on parent ion from data obtained in the second mass analysis step; a reference data read-out step of reading out mass spectrums corresponding to molecular components determined in said molecular weight determination step, based on a reference database made by storing mass spectrums of compounds for each compound in case of exciting the compounds through electro impact ionization method; and a comparison step of comparing ion intensity data obtained in said first mass analysis step with data read out in said reference data read-out step, wherein components of said first gas are determined based on the comparison result in said comparison step.