triplet state वाक्य
उदाहरण वाक्य
मोबाइल
- 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.
- Where \ F is the fraction of particles that have entered the triplet state and \ \ tau _ F is the corresponding triplet state relaxation time.
- Where \ F is the fraction of particles that have entered the triplet state and \ \ tau _ F is the corresponding triplet state relaxation time.
- For phosphorescence, absorbed photons undergo intersystem crossing where they enter into a state with altered spin multiplicity ( see term symbol ), usually a triplet state.
- For example, the copper metallated octaethylbenzochlorin photosensitiser has a triplet state lifetime of less than 20 nanoseconds and is still deemed to be an efficient photodynamic agent.
- 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.
- Excited organic molecules can also relax via conversion to a triplet state, which may subsequently relax via phosphorescence, or by a secondary non-radiative relaxation step.
- The singlet state is believed be more reactive than the ground state triplet state, in the same way that singlet oxygen is more reactive than the triplet oxygen.
- For example, a triplet transition quantum yield is the fraction of molecules that, after being photoexcited into a singlet state, cross over to the triplet state.
- An exciton formed by the recombination of two such particles may either be in a singlet state or a triplet state, depending on how the spins have been combined.
- It is formed when triplet oxygen, the normal ground state, reacts with sensitizers, such as certain dyes and ketones, excited by radiation to their triplet states.
- The efficiency of Type-II processes is dependent upon the triplet state lifetime " ? " T and the triplet quantum yield ( ?T ) of the photosensitiser.
- If the dynamics of interest are much slower than the triplet state relaxation, the short time component of the autocorrelation can simply be truncated and the triplet term is unnecessary.
- As long as the molecule is in the long-lived dark state ( e . g . a triplet state ), it cannot be excited from the ground state.
- Molecular oxygen ( ) also exists in three lower-energy triplet states and one singlet state, as ground-state paramagnetic triplet oxygen and energized highly reactive diamagnetic singlet oxygen.
- Thus, in the helium atom, Hund's first rule correctly predicts that the 1s2s triplet state ( 3 S ) is lower than the 1s2s singlet ( 1 S ).
- This state has a slightly higher energy ( by about 9 kcal / mol ) than the triplet state, and its H-C-H angle is smaller, about 102?
- The excited electron can then undergo a second spin-forbidden inversion and depopulate the excited triplet state ( T1 ) by decaying to the ground state ( S0 ) via phosphorescence ( T1?
- The triplet state is not allowed in the ground state of the helium atom, since the spatial function in this case is symmetric and the spin function needs to be anti-symmetric.
- This excess excitation energy leads to an increase in the lifetime of singlet excited chlorophyll, increasing the chances of the formation of long-lived chlorophyll triplet states by inter-system crossing.
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