Visible and UV coherent Raman spectroscopy of dipicolinic acid.
We use time-resolved coherent Raman spectroscopy to obtain molecule-specific signals from dipicolinic acid (DPA), which is a marker molecule for bacterial spores. We use femtosecond laser pulses in both visible and UV spectral regions and compare experimental results with theoretical predictions. By exciting vibrational coherence on more than one mode simultaneously, we observe a quantum beat signal that can be used to extract the parameters of molecular motion in DPA. The signal is enhanced when an UV probe pulse is used, because its frequency is near-resonant to the first excited electronic state of the molecule. The capability for unambiguous identification of DPA molecules will lead to a technique for real-time detection of spores.
Pestov
Dmitry
D
Institute for Quantum Studies, Texas A&M University, College Station, TX 77843-4242, USA.
Zhi
Miaochan
M
Sariyanni
Zoe-Elizabeth
ZE
Kalugin
Nikolai G
NG
Kolomenskii
Alexandre A
AA
Murawski
Robert
R
Paulus
Gerhard G
GG
Sautenkov
Vladimir A
VA
Schuessler
Hans
H
Sokolov
Alexei V
AV
Welch
George R
GR
Rostovtsev
Yuri V
YV
Siebert
Torsten
T
Akimov
Denis A
DA
Graefe
Stefanie
S
Kiefer
Wolfgang
W
Scully
Marlan O
MO
D015415:Biomarkers; D004791:Enzyme Inhibitors / Q000737:chemistry*; D008433:Mathematics; D010848:Picolinic Acids / Q000032:analysis*; D013059:Spectrum Analysis, Raman / Q000295:instrumentation / Q000379:methods*; D013171:Spores, Bacterial / Q000737:chemistry*
D015415:Biomarkers; D004791:Enzyme Inhibitors; D010848:Picolinic Acids; C004860:dipicolinic acid