Transient Absorption Spectroscopy

The transient absorption (TA) experiment allows quantitative characterization of time-dependent absorption of an optically excited sample. Two light pulses are required: femtosecond narrow-bandwidth pump pulse to excite the sample and delayed broad-bandwidth probe pulse to measure the changes in sample transmittance. The resulting difference absorption signal is measured as a function of probe wavelength and the temporal delay between the pump and probe pulses.

The TA spectrum is much more elaborate than, e.g., a steady-state absorption or fluorescence decay spectrum. It provides information not only on the excited states of the system but also on all the intermediate evolutionary transients and non-emissive states both on the ground and the excited states.

In HARPIA-TA, the TA experiment can be easily customized to get additional insight into the ultrafast dynamics of photoactive systems. For example, measuring transient reflection instead of absorption would provide more details on material surface photodynamics. Performing pump intensity-resolved absorption would help estimate the annihilation and saturation processes. Carrying TA experiments with different linear or circular pump pulse polarizations would allow obtaining molecular aggregation properties or molecular-level chirality-dependent spectra.

When the transient spectroscopy is not enough, the HARPIA-TA spectrometer can be expanded to perform time-resolved multi‑pulse and fluorescence spectroscopies using HARPIA-TB and HARPIA-TF modules, respectively.

  • Excellent performance at a high repetition rate
  • Measurement range from UV to MIR
  • Market-leading sensitivity
  • Modules for time-resolved, and multi-pulse experiments
  • High-level automation in a compact footprint
  • Market-leading sensitivity
  • 330 nm – 24 μm spectral range
  • Probe delay ranges from 2 to 8 ns
  • Pump pulse energies down to nJ
  • Cryostat and peristaltic pump support
  • Delivery of an additional femtosecond or picosecond beam
  • Polarization, intensity, and delay control
  • Femtosecond stimulated Raman scattering (FSRS) support
  • Z-scan support
  • Tunable pulse duration, 100 fs – 20 ps
  • Maximum pulse energy of up to 4 mJ
  • Down to < 100 fs right at the output
  • Pulse-on-demand and BiBurst for pulse control
  • Up to 5th harmonic or tunable extensions
  • CEP stabilization or repetition rate locking
  • Thermally-stabilized and sealed design
  • Tunable pulse duration, 190 fs – 20 ps
  • Maximum output of 120 W and 2 mJ
  • Single-shot – 2 MHz repetition rate
  • Pulse-on-demand and BiBurst for pulse control
  • Up to 5th harmonic or tunable extensions
  • Air-cooled model
  • Compact industrial-grade design
  • Continuous tunability from UV to MIR, 190 – 16000 nm
  • High energy and high power models for all needs
  • Single-shot – 2 MHz repetition rate
  • Up to 80 W pump power
  • Up to 2 mJ pump pulse energy

Effect of intramolecular charge transfer processes on amplified spontaneous emission of D–π–A type aggregation-enhanced emission molecules

Y. Li, P. Han, X. Zhang, J. Zhou, X. Qiao, D. Yang, A. Qin, B. Z. Tang, J. Peng, and D. Ma, Journal of Materials Chemistry C 9 (11), 3284-3291 (2023).

Electrically driven amplified spontaneous emission from colloidal quantum dots

N. Ahn, C. Livache, V. Pinchetti, H. Jung, H. Jin, D. Hahm, Y. Park, and V. I. Klimov, Nature 7959 (617), 79-85 (2023).

Packing-induced selectivity switching in molecular nanoparticle photocatalysts for hydrogen and hydrogen peroxide production

H. Yang, C. Li, T. Liu, T. Fellowes, S. Y. Chong, L. Catalano, M. Bahri, W. Zhang, Y. Xu, L. Liu et al., Nature Nanotechnology 3 (18), 307-315 (2023).

Solution-grown BiI/BiI3 van der Waals heterostructures for sensitive X-ray detection

R. Zhuang, S. Cai, Z. Mei, H. Liang, N. Zhao, H. Mu, W. Yu, Y. Jiang, J. Yuan, S. Lau et al., Nature Communications 1 (14) (2023).

Spin-exchange carrier multiplication in manganese-doped colloidal quantum dots

H. Jin, C. Livache, W. D. Kim, B. T. Diroll, R. D. Schaller, and V. I. Klimov, Nature Materials 8 (22), 1013-1021 (2023).

Atomic structure of a seed-sized gold nanoprism

Y. Song, Y. Li, M. Zhou, H. Li, T. Xu, C. Zhou, F. Ke, D. Huo, Y. Wan, J. Jie et al., Nature Communications 1 (13) (2022).

Charge Photogeneration and Recombination in Fluorine-Substituted Polymer Solar Cells

R. Hu, Y. Liu, J. Peng, J. Jiang, M. Qing, X. He, M. Huo, and W. Zhang, Frontiers in Chemistry 10 (2022).

Cobalt(III) Carbene Complex with an Electronic Excited-State Structure Similar to Cyclometalated Iridium(III) Compounds

N. Sinha, B. Pfund, C. Wegeberg, A. Prescimone, and O. S. Wenger, Journal of the American Chemical Society 22 (144), 9859-9873 (2022).


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