Raman scattering and red fluorescence in the photochemical transformation of dry tryptophan particles
Abstract
Tryptophan is a fluorescent amino acid common in proteins. Its absorption is largest for wavelengths λ ≲ 290 nm and its fluorescence emissions peak around 300–350 nm, depending upon the local environment. Here we report the observation of red fluorescence near 600 nm emerging from 488-nm continuous-wave (CW) laser photoexcitation of dry tryptophan (Trp) particles. With an excitation intensity below 0.5 kW/cm2, dry Trp particles yield distinctive Raman scattering peaks in the presence of relatively weak and spectrally broad emissions with λ ~500–700 nm, allowing estimation of particle temperature at low excitation intensities. When the photoexcitation intensity is increased to 1 kW/cm2 or more for a few minutes, fluorescence intensity dramatically increases by more than two orders of magnitude. The fluorescence continues to increase in intensity and gradually shift to the red when photoexcitation intensity and the duration of exposure are increased. The resulting products absorb at visible wavelengths and generate red fluorescence with λ ~ 650–800 nm with 633-nm CW laser excitation. In conclusion, we attribute the emergence of orange and red fluorescence in the Trp products to a photochemical transformation that is instigated by weak optical transitions to triplet states in Trp with 488-nm excitation and which maymore »
- Authors:
-
- U.S. Army Research Lab., Adelphi, MD (United States); Michigan State Univ., East Lansing, MI (United States)
- U.S. Army Research Lab., Adelphi, MD (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1266213
- Grant/Contract Number:
- HDTRA1619734; HDTRS1518237; DMR-0955944; W911NF-12-2-0019; AC04-94AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Optics Express
- Additional Journal Information:
- Journal Volume: 24; Journal Issue: 11; Journal ID: ISSN 1094-4087
- Publisher:
- Optical Society of America (OSA)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; scattering; Raman; spectroscopy, fluorescence and luminescence; photochemistry
Citation Formats
Lai, Chih Wei, Schwab, Mark, Hill, Steven C., Santarpia, Joshua, and Pan, Yong -Le. Raman scattering and red fluorescence in the photochemical transformation of dry tryptophan particles. United States: N. p., 2016.
Web. doi:10.1364/OE.24.011654.
Lai, Chih Wei, Schwab, Mark, Hill, Steven C., Santarpia, Joshua, & Pan, Yong -Le. Raman scattering and red fluorescence in the photochemical transformation of dry tryptophan particles. United States. https://doi.org/10.1364/OE.24.011654
Lai, Chih Wei, Schwab, Mark, Hill, Steven C., Santarpia, Joshua, and Pan, Yong -Le. Thu .
"Raman scattering and red fluorescence in the photochemical transformation of dry tryptophan particles". United States. https://doi.org/10.1364/OE.24.011654. https://www.osti.gov/servlets/purl/1266213.
@article{osti_1266213,
title = {Raman scattering and red fluorescence in the photochemical transformation of dry tryptophan particles},
author = {Lai, Chih Wei and Schwab, Mark and Hill, Steven C. and Santarpia, Joshua and Pan, Yong -Le},
abstractNote = {Tryptophan is a fluorescent amino acid common in proteins. Its absorption is largest for wavelengths λ ≲ 290 nm and its fluorescence emissions peak around 300–350 nm, depending upon the local environment. Here we report the observation of red fluorescence near 600 nm emerging from 488-nm continuous-wave (CW) laser photoexcitation of dry tryptophan (Trp) particles. With an excitation intensity below 0.5 kW/cm2, dry Trp particles yield distinctive Raman scattering peaks in the presence of relatively weak and spectrally broad emissions with λ ~500–700 nm, allowing estimation of particle temperature at low excitation intensities. When the photoexcitation intensity is increased to 1 kW/cm2 or more for a few minutes, fluorescence intensity dramatically increases by more than two orders of magnitude. The fluorescence continues to increase in intensity and gradually shift to the red when photoexcitation intensity and the duration of exposure are increased. The resulting products absorb at visible wavelengths and generate red fluorescence with λ ~ 650–800 nm with 633-nm CW laser excitation. In conclusion, we attribute the emergence of orange and red fluorescence in the Trp products to a photochemical transformation that is instigated by weak optical transitions to triplet states in Trp with 488-nm excitation and which may be expedited by a photothermal effect.},
doi = {10.1364/OE.24.011654},
journal = {Optics Express},
number = 11,
volume = 24,
place = {United States},
year = {Thu May 19 00:00:00 EDT 2016},
month = {Thu May 19 00:00:00 EDT 2016}
}
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