The excited state undergoes an intersystem crossing from the singlet state to a triplet state in which there are two electrons with parallel spin.
32.
Kasha's rule stipulates that higher singlet states would quickly relax by radiationless decay or internal conversion ( IC ) to S 1.
33.
Molecular orbital theory predicts two low-lying excited singlet states, denoted by the molecular term symbols 1 ? g and 1 ?.
34.
The two singlet states are denoted 1 ? and 1 ? g ( the preceding superscripted " 1 " indicates it as a singlet state ).
35.
The two singlet states are denoted 1 ? and 1 ? g ( the preceding superscripted " 1 " indicates it as a singlet state ).
36.
A molecule can have a singlet state or triplet state with different energy and both states can inter-convert by a process called intersystem crossing.
37.
S 0 is called the ground state of the fluorophore ( fluorescent molecule ), and S 1 is its first ( electronically ) excited singlet state.
38.
When a singlet state nonradiatively passes to a triplet state, or conversely a triplet transitions to a singlet, that process is known as intersystem crossing.
39.
For example, dibromomethane and hexafluorobenzene deactivate the higher-energy singlet state, decelerating the rate of intersystem crossing in accordance with earlier studies of diphenylcarbene.
40.
At room temperature, O 2 exists in a triplet state, which can only undergo a chemical reaction by making the forbidden transition into a singlet state.
