Patent ID: 8803087

Claim:
A spectrum analyzer analyzing a composition distribution of a sample in the depth direction based on an energy spectrum of scattered particles scattered at the sample by irradiation with ion beams, the sample including at least one object layer to be analyzed which contains at least one element, said spectrum analyzer comprising: an ion beam generator; scattering angle-setting means for setting a scattering angle of ion beams which are emitted from said ion beam generator and which are scattered at the sample, including a simulator for obtaining specific scattering angles where an independent energy spectrum of said at least one element of the object layer independently appears, and setting the scattering angle according to the specific scattering angles; measured spectrum-obtaining means for obtaining a measured energy spectrum by measuring energy of scattered particles scattered in the direction of the scattering angle set by said scattering angle-setting means, the scattered particles being scattered from the sample when the sample is irradiated with the ion beams; independent spectrum-extraction means for extracting an independent energy spectrum of said at least one element of the object layer which independently appears in the measured energy spectrum obtained by said measured spectrum-obtaining means; means for obtaining a standard energy spectrum of a standard sample having a known composition distribution and layer thickness in the depth direction; and layer thickness-calculation means for calculating the thickness of the object layer based on a spectrum area surrounded by the waveform of the independent energy spectrum extracted by said independent spectrum-extraction means, wherein said layer thickness-calculation means calculates the thickness of the object layer by comparing the spectrum area surrounded by the waveform of the independent energy spectrum with a spectrum area surrounded by the waveform of the standard energy spectrum.