Question

What specific name can be given to the following sequence of steps: $Hg+hv\to H{g}^{\ast }$

$H{g}^{\ast }+H_2\to H_2^{\ast }+Hg$

• A. Fluorescence
• B. Phosphorescence
• C. Photosensitization
• D. Chemilumionescence

Answer 1

The correct option is A Fluorescence

$Hg+hv\to H{g}^{\ast }$

$H{g}^{\ast }+H_2\to H_2^{\ast }+Hg$

It is fluorescence as $Hg$ emitted the light which it absorbs in first step. (Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. It is a form of luminescence. In most cases, the emitted light has a longer wavelength and therefore, lower energy than the absorbed radiation)