Photochemistry

This process promotes the molecule from the S₀ to one of the vibration levels of the singlet excited states (S₁, S₂,..)

• Absorption of photon

• Emission of photon

• Fluorescence

• Vibrational relaxation

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-1

(a)   fastest transition 10^-15 s and it Starts from Ground level.

Tags

NGSS.HS-PS4-3

Stark Einsteins law is applicable to

• Primary process

• secondary process

• chain termination process

• thermal reactions

Quantum yield of a photo chemical reaction is always one.

• Agree

• Disagree

• May be

Which of the following is a non-radiative transition

to a lower vibrational level within the same electronic state

• Internal conversion

• fluorescence

• inter system crossing

• vibrational relaxation

Which of the following is a non-radiative transition between two electronic states of the same spin multiplicity.

• Internal conversion

• Inter-system crossing

• vibrational relaxation

• Phosphorescence

Which of the following is a radiative transition between two electronic states of the same spin multiplicity and instantaneous process ?

• Phosphorescence

• fluorescence

• chemiluminescence

• photosensitization

Tags

NGSS.HS-PS4-3

which one of the following is a non-radiative transition between two iso-energetic vibrational levels belonging to electronic states of different spin multiplicity

• Phosphorescence

• Inter-system crossing

• Fluorescence

• internal conversion

____________ is a radiative transition between two electronic states of different spin multiplicity and occurs for a longer time even after the source is cut off.

• Fluorescence

• Phosphorescence

• Bio-luminescence

• Photo-sensitization

Tags

NGSS.HS-PS4-3

(a)   is the number of molecules reacted divided by the number of photons absorbed by the system.