Rapid Scan EPR | RS-EPR Technique

Rapid Scan-EPR is a revolutionary technique that can improve the signal to noise ratio and significantly decreases the acquisition time (down to milliseconds).

The main advantage of RS-EPR comes from the later onset of signal saturation, allowing higher microwave powers to be used. This increases the signal amplitude relative to CW-EPR, leading to a much higher signal-to-noise ratio. The short acquisition time in RS-EPR allows extensive signal averaging and very high time resolution. Compared to CW-EPR, RS-EPR delivers higher signal to noise in the same total experimental time. With sweep times as low as 10 microseconds, short lived EPR species can be observed, and their changes can be followed precisely.

Impressive signal-to-noise gain vs CW-EPR.
Reaction monitoring with unprecedented time resolution
Available as an accessory for EMXplus and ELEXSYS systems
Low temperature compatible (4K -300K).

The Rapid Scan components:

Driver
Acquisition Unit
Resonator
MW Frontend with I/Q Detector
Coils
Water cooler for coils
Capacitor unit

Applications

The Rapid Scan accessory allows for tracking kinetics of chemical reactions due to the high time resolution it affords. In combination with light irradiation with the optical fiber on the Rapid Scan Resonator, photochemical reactions can be monitored.

Changes in solution pH are tracked by sensitive nitroxides in the presence of photoacid molecules. Upon light illumination, the photoacid releases a proton, thus decreasing the pH of the solution and the Nitroxide EPR spectra changes rapidly.

Formation of fleeting spin radical adducts upon light-irradiation, for example with TiO₂ nanoparticles when exposed to UV light, can also be tracked by Rapid Scan EPR. The radical species generated occur on different time scales, which is hard to capture with conventional CW-EPR. With Rapid Scan, the radical adducts can be detected and the kinetics of each can be followed (insert image of TiO2 spectra).

DMPO Spin Trapping Adducts:

Superoxide (black), Hydroxyl radical (blue), Methyl radical (red)

Webinars

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Bruker EPR: Rapid Scan Info Day

In this live online event taking place in our Bruker demo labs, we will demonstrate the use and applications of the Rapid Scan EPR solution as a complementary method to CW- and pulse- EPR spectroscopy.

Investigating fast chemical reactions using the enhanced time resolution of Rapid Scan EPR (Electron Paramagnetic Resonance)

Many paramagnetic systems are very reactive and short-lived. Rapid Scan EPR detects these species and follows the fast reaction kinetics.

Introducing the next revolution in EPR, the Rapid Scan Accessory

Rapid Scan EPR is the next step in EPR technology and experiments which improves both sensitivity and time resolution.

Scientific On-Demand Webinars

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Rapid Scan related literature

Since 1995, the very high level of sensitivity in Continuous Wave EPR (CW-EPR) has technologically reached its maximum. Recently a new method of acquiring the EPR signal, Rapid Scan EPR (RS‑EPR), has been pioneered by the Eaton research lab at the University of Denver.

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