FTP, identify this type of spectroscopy which uses light longer in wavelength than that of visible light.
The three most important factors influencing this test are the masses of the atoms involved in the bond, the strength of the bond, and the type of vibration being observed.    Although the absorptions in the wavenumber range from 1000-1600 inverse centimeters are not analyzed in detail, they provide information that helps in identifying the molecule and is thus called the fingerprint region.  FTP, identify this type of spectroscopy which uses light longer in wavelength than that of visible light.
The three most important factors influencing this test are the masses of the atoms involved in the bond, the strength of the bond, and the type of vibration being observed.    
IR or infrared spectroscopy