Ultrafast Transient Spectroscopy of Trans-Polyacetylene in the Midinfrared Spectral Range.
Phys Rev Lett
; 124(1): 017401, 2020 Jan 10.
Article
in En
| MEDLINE
| ID: mdl-31976729
ABSTRACT
Trans-polyacetylene [t-(CH)_{x}] possesses twofold ground state degeneracy. Using the Su-Schrieffer-Heeger Hamiltonian, scientists predicted charged solitons to be the primary photoexcitations in t-(CH)_{x}; this prediction, however, has led to sharp debate. To resolve this saga, we use subpicosecond transient photomodulation spectroscopy in the mid-IR spectral range (0.1-1.5 eV) in neat t-(CH)_{x} thin films. We show that odd-parity singlet excitons are the primary photoexcitations in t-(CH)_{x}, similar to many other nondegenerate π-conjugated polymers. The exciton transitions are characterized by two photoinduced absorption (PA) bands at 0.38 and 0.6 eV, and an associated photoluminescence band at â¼1.5 eV having similar polarization memory. The primary excitons undergo internal conversion within â¼100 fs to an even-parity (dark) singlet exciton with a PA band at â¼1.4 eV. We also find ultrafast photogeneration of charge polarons when pumping deep into the polymer continuum band, which are characterized by two other PA bands in the mid-IR and associated photoinduced IR vibrational modes.
Full text:
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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Phys Rev Lett
Year:
2020
Document type:
Article