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phototransient
phototransient n. 
/ˌfəʊtə(ʊ)ˈtrɑːnzɪənt/, /ˌfəʊtə(ʊ)ˈtransɪənt/, /ˌfəʊtə(ʊ)ˈtrɑːnsɪənt/, /ˌfoʊdoʊˈtrænʒ(ə)nt/, /ˌfoʊdoʊˈtrænziənt/ Chemistry a short-lived molecular species produced by irradiation.
Brit. /ˌfəʊtə(ʊ)ˈtranzɪənt/
, /ˌfəʊtə(ʊ)ˈtranzɪənt//ˌfəʊtə(ʊ)ˈtrɑːnzɪənt//ˌfəʊtə(ʊ)ˈtransɪənt//ˌfəʊtə(ʊ)ˈtrɑːnsɪənt/U.S. /ˌfoʊdoʊˈtræn(t)ʃ(ə)nt/
, /ˌfoʊdoʊˈtræn(t)ʃ(ə)nt//ˌfoʊdoʊˈtrænʒ(ə)nt//ˌfoʊdoʊˈtrænziənt/ΘΚΠ
the world > matter > physics > electromagnetic radiation > light > scientific effects of light > [noun] > production by > product of > transient
phototransient1973
1973 Physics Bull. July 431/1 It is obvious that for light induced species with large lifetimes, a simple dc method would suffice to measure their absorption. However, with the short lifetimes associated with excited states, the changes occurring in dc current by the absorption of the phototransient will be much smaller than the noise.
1975 Nature 25 Dec. 767/2 Evidence was obtained that this phenomenon is a consequence of an overlap from a shorter lived phototransient (maximum about 530 nm) which is the precursor of the 410-nm species.
2000 Jrnl. Amer. Chem. Soc. 122 389/1 On pyrolysis of the model compound, pyrenebutanoic acid.., phototransients assigned to the viologen radical ion..and the pyrene radical cation..were observed.
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