Sub-5-fs spectroscopy of a thiophene derivative with a quinoid structure

Sub-5-fs spectroscopy of a thiophene derivative with an electron donative and an acceptive moieties and quinoid structure provided the experimental evidence of dynamic mode coupling. It was shown that two out-of-plane bending modes mediate the dynamic mode coupling between 1469 and 1379 cm−1 and between 1603 and 1469 cm−1. These couplings are considered to be associated with geometrical relaxation relevant to the neutral bipolaron formation in all-s-trans polyacetylene.

Out-of-plane bending mode mediate the dynamic mode coupling between 1469 and 1379 cm−1 and between 1603 and 1469 cm−1 was found in a thiophene derivative with an electron donative and an acceptive moieties and quinoid structure after the sub-5-fs pulse excitation.