Pressure and power broadening of the a10 component of R(56) 32-0 transition of molecular iodine at 532 nm

We determine the linewidth of the hyperfine structure a10 component of R(56) 32-0 transition of 127I2 at 532 nm using the dependence of the peak amplitude of the third-derivative signal on the modulation width. We also use the same method to investigate pressure broadening and power broadening of the a10 component.