You can optimize your structure with optimization+ frequenty to get IR.. It can be seen in the results tab of the output file..

The question is unclear. IR and FT-IR differ in the instrumental architecture and treatment (Fourier Transform) of collected IR signals, but the number of infrared peaks, their energy and relative instensity are the same, although FT allows for a better resolution in a shorter time.

If the question regards visualization there are a number of commercial software suites that can graphically represent IR spectra, including GaussView, Molden, Chemissian and many others. In past years, we also published a programme, PyFreq, for this purpose, including normalizing and scaling tools, as well as the possibility to overlap experimental and calculated spectra. PyFreq was published here: Article Reactivity of Fluoro-Substituted Bis(thiocarbonyl) Donors wi...

You can use Gaussview and try frequency calculations.

Thank you for the rapid answer. I try to clarify my question. I calculate the IR spectra using the Gaussian software. And I want to get the FTIR spectra. Is there any way to do that

Thank again

opt=freq