In the second chapter, FTS, ICLAS-VeCSEL were used to present a systematical investigation on IR spectra of N_2O, C_2H_2, CO_2. First, we briefly introduce the theory of the energy level and the select rules of the linear molecule.

• 在第二章中，我们使用FTS和ICLAS技术对记录了N_2O、C_2H_2、CO_2等分子及其同位素的吸收光谱。 并解析其谱线位置。