Structure of SO3 Molecule
The SO3 molecule has a trigonal planar structure with all three oxygen atoms symmetrically arranged around the sulfur atom. This arrangement results in a bond angle of 120 degrees between the sulfur-oxygen bonds.

IR Radiation Spectrum of SO3
- The IR radiation spectrum of SO3 shows characteristic peaks corresponding to the vibrational modes of the molecule.
- The asymmetric stretching vibration of the S-O bonds results in a strong peak around 1360 cm-1, while the symmetric stretching vibration gives rise to a peak around 1040 cm-1.
- Additionally, the bending vibrations of the molecule produce peaks at lower wavenumbers, around 450-600 cm-1.

Explanation of the Structure
- The trigonal planar structure of SO3 is due to the sp2 hybridization of the sulfur atom, which forms three sigma bonds with the oxygen atoms.
- The delocalization of electrons in the molecule leads to resonance stabilization, making SO3 a stable compound despite its high reactivity.
- The symmetric and asymmetric stretching vibrations observed in the IR spectrum correspond to the stretching and compressing of the S-O bonds, while the bending vibrations involve a change in the bond angle.
In conclusion, the structure of the SO3 molecule and its corresponding IR radiation spectrum provide valuable insights into its molecular geometry and vibrational modes.