# Near shot-noise limited time-resolved circular dichroism pump-probe spectrometer

Source: [Near shot-noise limited time-resolved circular dichroism pump-probe spectrometer](<https://www.sota2.com/research/paper/68fa37711e209131ce8b2656>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T22:24:55.604Z

Authors: Valentyn Stadnytskyi, Gregory S. Orf, Robert E. Blankenship, Sergei Savikhin

Published: 2017-06-23T15:41:37.000Z

## Abstract

We describe an optical near shot-noise limited time-resolved circular dichroism (TRCD) pump-probe spectrometer capable of reliably measuring {\\mu}deg circular dichroism signal with nanosecond time resolution. Such sensitivity is achieved through a modification of existing TRCD designs and introduction of a new data processing protocol that eliminates approximations that have caused substantial nonlinearities in past measurements and allows the measurement of absorption and CD transients simultaneously with a single pump pulse. The exceptional signal-to-noise ratio of the described setup makes TRCD technique applicable to a large range of non-biological and biological systems. The spectrometer was used to record, for the first time, weak TRCD kinetics associated with triplet state energy transfer in the photosynthetic Fenna-Matthews-Olson antenna pigment-protein complex.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1706.07754>)

[PDF](<https://arxiv.org/pdf/1706.07754.pdf>)