High Quality Content by WIKIPEDIA articles! Ultraviolet-visible spectroscopy or ultraviolet-visible spectrophotometry (UV-Vis or UV/Vis) involves the spectroscopy of photons in the UV-visible region This means it uses light in the visible and adjacent (near ultraviolet (UV) and near infrared (NIR)) ranges The absorption in the visible одншо ranges directly affects the color of the chemicals involved In this region of the electromagnetic spectrum, molecules undergo electronic transitions This technique is complementary to fluorescence spectroscopy, in that fluorescence deals with transitions from the excited state to the ground state, while absorption measures transitions from the ground state to the excited state.  Fantast2010 г Мягкая обложка, 108 стр ISBN 613038940X.