Optical Spectroscopy facility houses a variety of equipment ranging from steady-state spectrometers working is various spectral regions to a broad range of time-resolved spectroscopy setups which cover a broad spectral range from UV to mid-IR and feature a time resolution of up to 40 fs.
Laser Spectroscopic Facilities
Optical Spectroscopy Facilities
- Excimer Lasers for Pulsed Laser Desorption/ Ionization
- Nanosecond Excimer and Nd:YAG lasers for gas phase photodissociation
- Femtosecond time resolved pump probe spectroscopy and two dimensional infrared experiments in condensed phase.
- Nd: YAG laser pumped nanosecond visible transient absorption spectroscopy
- Diode laser pump for time correlated single photon counting of fluorescence on the 1-1000 ns timescale
For further information please contact Professors Koplitz, Rubtsov or Sulkes
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Nanosecond Pump/Probe Spectroscopy
- Tunable excitation wavelength: 1064 nm, 532 nm, 355 nm, and 355 nm, and Optical-Parametric-Oscillator-tunable wavelengths covering a wide range of wavelengths from 420 to 850 nm
- Fast spectral acquisition
- Combined with "stop-flow" instrumentation for flow-flash experiments
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Femtosecond Laser Facilities
- Ti:Sapphire laser system (oscillator/regenerative amplifier); Coherent Inc. Vitesse / Legend USP
- 43 fs pulses of 1 mJ per pulse
- 805 nm wavelength
- Two Optical Parametric Amplifiers generate powerful laser pulses at 1 kHz repetition rate
- Wavelength tunable from 300 nm to 1.9 mm
- Pulse energies up to 0.1 mJ per pulse
- Pulse-to-pulse stability better than 0.5%
Several optical spectroscopic methods are implemented using the Ti:Sapphire laser system |
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Femtosecond Transient Absorption Spectrometer in UV-Visible-NIR Spectral Regions
- 30 fs time resolution
- Excitation and probe wavelengths tunable from 300 to 1200 nm
- Fast spectra acquisition
- Background noise < 0.5 mOD per second of accumulation
Graduate student Gopal Naraharisetty adjusts the beam overlap for transient measurements |
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Mid-IR Femtosecond Transient Absorption Spectrometer
- 40 fs time resolution
- Excitation wavelengths tunable from 1350 to 5000 cm-1
- Low background noise, < 0.5 mOD
Graduate student Dmitry Kurochkin is preparing for the transient mid-IR experiments on synthetic peptides |
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Graduate student Robert Combs is tuning Nd:YAG laser used for laser ablation experiments |
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| Graduate student Lucinda Pringle adjusts the output from a pulse amplified ring laser system used for high-resolution Doppler studies |
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Postdoctoral fellow Ranganathan Subramanian working on molecular beam apparatus |
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Steady State Fluorescence Spectrometer
- Interchangeable excitation light source
- Transmission and reflection operation regimes
- CCD and PMT detection
Graduate student Emily Golden is working on measuring fluorescence of b-glucosidase |
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Fourier-Transform Infrared Spectrometer
- Transmission and reflection operation regimes
- Frequency range of 100 - 10000 cm-1
- Low noise design
Graduate student Arun Narayun is measuring the vibrational spectrum of a polyimide |
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FTIR Spectrometer
- Frequency range of 100 - 5000 cm-1
- Transmission regimes
- Convenient measuring vibrational spectra of liquid samples
Graduate student Srivathsa Vaidya is measuring vibrational spectrum of a terpyridyl derivative |
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Circular-Dicroism Optical Spectrometer
- Designed to measure chirality of peptides and proteins
- Spectral region from 180 nm to 900 nm
Graduate student Yuriy Sereda is measuring the CD spectrum of peptides
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