- Femtosecond-to-microsecond measurements
- Automated switching between fluorescence upconversion and TCSPC
- Automated spectral scanning and calibration
- Optional operation as a stand-alone unit
The HARPIA-TF is a time-resolved fluorescence measurement module that combines fluorescence upconversion and TCSPC techniques. In fluorescence upconversion, the signal from the sample is mixed in a nonlinear crystal with a gating femtosecond pulse to achieve high temporal resolution, which is limited by the duration of the gate and pump pulses. For fluorescence decay times in the nanosecond to microsecond range, the instrument can be used in time-correlated single‑photon counting (TCSPC) mode to measure kinetic traces up to 5 μs. The combination of the two methods enables the measurement of spectrally-resolved fluorescence decay in the femtosecond to microsecond range. Using a high repetition rate PHAROS or CARBIDE laser, the fluorescence dynamics can be measured while exciting the samples with pulse energies down to several nanojoules.
|Spectral range 1)||300 – 1600 nm|
|Spectral resolution 2)||≈ 100 cm-1|
|Delay range||2 ns / 4 ns / 8 ns|
|Delay resolution||2.1 fs / 4.2 fs / 8.3 fs|
|Temporal resolution||< 1.4× pump or gate pulse duration, whichever is longer|
|SNR 3)||65 : 1|
- Depends on the gating source, full range covered with different nonlinear crystals.
- Limited by the spectral bandwidth of the gating pulse.
- Estimated as the standard deviation of a set of 100 points at 50 ps intervals measured in Rhodamine 6G dye at an upconverted wavelength of 360 nm using a PHAROS laser running at 150 kHz repetition rate; assuming 0.5 s averaging per point. Not applicable to all samples and configurations.
|Spectral range 1)||320 – 820 nm|
|TCSPC detector 2)||Standard||High-speed|
|Temporal resolution||< 180 ps||< 50 ps|
|Maximum measurement range 3)||5 μs|
|SNR 4)||100 : 1|
- Spectral range is extendable to NIR; contact email@example.com for details.
- Different models available; contact firstname.lastname@example.org for details.
- Maximum measurement range can be extended with a phosphorescence upgrade.
- Estimated by fitting a kinetic trace measured in Rhodamine 6G solution at 580 nm with multiple exponents, subtracting the fit from the data and taking the ratio between the standard deviation of the residuals and the 0.5× maximum signal value, at 250 kHz repetition rate; assuming 5 s averaging per trace. Not applicable to all samples and configurations.
|Physical dimensions (L × W × H) 1)||571 × 275 × 183 mm|
- Without external spectrograph.
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Large π-Conjugated Metal–Organic Frameworks for Infrared-Light-Driven CO2 Reduction
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Ultrafast Excited-State Proton Transfer of a Cationic Superphotoacid in a Nanoscopic Water Pool
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A Tandem 0D/2D/2D NbS 2 Quantum Dot/Nb 2 O 5 Nanosheet/g-C 3 N 4 Flake System with Spatial Charge–Transfer Cascades for Boosting Photocatalytic Hydrogen Evolution
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T. H. Lee, S. Y. Park, W. Park, X. Du, J. H. Son, N. Li, O. Kwon, H. Y. Woo, C. J. Brabec, and J. Y. Kim, ACS Energy Letters 5 (5), 1628-1635 (2020).
Enhanced Proton Conductivity across Protein Biopolymers Mediated by Doped Carbon Nanoparticles
S. Mondal, Y. Agam, and N. Amdursky, Small, 2005526 (2020).
Exploring long-range proton conduction, the conduction mechanism and inner hydration state of protein biopolymers
S. Mondal, Y. Agam, R. Nandi, and N. Amdursky, Chemical Science 13 (11), 3547-3556 (2020).
HARPIA-TF Femtosecond Fluorescence Upconversion and TCSPC Module
Rev. 05/01/2022. Size 395 KB.
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