TY - JOUR
T1 - Two-photon excitation spectroscopy of 1,5–diphenyl-1,3,5-hexatriene using phase modulation
AU - Kumar, Pushpendra
AU - Karki, Khadga Jung
N1 - Publisher Copyright:
© 2019 The Author(s).
PY - 2019/3
Y1 - 2019/3
N2 - We have used two-photon Fourier transform spectroscopy to investigate the first singlet excited state (S1) of a prototypical polyene molecule 1,5—Diphenyl-1,3,5-hexatriene. As the S1 state in the polyenes is a one-photon forbidden transition, the structure of its vibrational levels cannot be studied using resonant linear excitation. Although this level is accessible with two-photon excitation, previous studies done by using wavelength tunable pulsed lasers did not have enough resolution to investigate the details of the vibrational levels. In Fourier transform spectroscopy, one uses a pair of laser beams to excite the sample. The measurements are done by varying the time delay between the pulses. The spectral resolution is given by the inverse of the maximum time delay rather than the spectral width of the pulses. We have used the method to investigate the vibrational levels of the S1 state. In our implementation, we have used phase modulation to carry out the measurements in the rotating frame, which requires less data points along the time delay thereby significantly reducing the measurement time.
AB - We have used two-photon Fourier transform spectroscopy to investigate the first singlet excited state (S1) of a prototypical polyene molecule 1,5—Diphenyl-1,3,5-hexatriene. As the S1 state in the polyenes is a one-photon forbidden transition, the structure of its vibrational levels cannot be studied using resonant linear excitation. Although this level is accessible with two-photon excitation, previous studies done by using wavelength tunable pulsed lasers did not have enough resolution to investigate the details of the vibrational levels. In Fourier transform spectroscopy, one uses a pair of laser beams to excite the sample. The measurements are done by varying the time delay between the pulses. The spectral resolution is given by the inverse of the maximum time delay rather than the spectral width of the pulses. We have used the method to investigate the vibrational levels of the S1 state. In our implementation, we have used phase modulation to carry out the measurements in the rotating frame, which requires less data points along the time delay thereby significantly reducing the measurement time.
KW - Excited states of diphenyl hexa-triene
KW - Fourier transform spectroscopy
KW - Two-photon excitation
UR - http://www.scopus.com/inward/record.url?scp=85065816078&partnerID=8YFLogxK
U2 - 10.1088/2399-6528/aafc0a
DO - 10.1088/2399-6528/aafc0a
M3 - 文章
AN - SCOPUS:85065816078
SN - 2399-6528
VL - 3
JO - Journal of Physics Communications
JF - Journal of Physics Communications
IS - 3
M1 - 035008
ER -