HELIOS | Ultrafast Systems

We did some experiments with the samples that we know very well and we noticed that the kinetics are distorted.

UFS December 31, 2022 No Comments

If a kinetic profile appears to be distorted (non-exponential, wrong lifetimes) it usually means that the delay stage needs to be realigned. Please refer to the probe alignment section of…

In the data acquisition software we get, as an output file, the difference between the absorbance with and without the pump pulse present. Is it possible to access the two measured sets of data before they are subtracted?

UFS December 31, 2022 No Comments

There is an option to save ‘raw data’ in the current Helios software. It is the measured spectra prior to the calculation of the delta A. That will produce two…

We are obtaining artifacts and this concerns me somewhat about whether this has to do with the algorithm for calculating the absorption. Can you comment on whether we are in fact measuring a true pump-on/pump-off intensity ratio, and whether there are any algorithm short-cuts that could be responsible for these artifacts in intensity?

UFS December 31, 2022 No Comments

The algorithm itself cannot be responsible for the artifacts (see its complete description in this knowledge base entry). We recommend checking if you have any spatial chirp and the second-order…

Is the chopper synchronized to the laser frequency to block every other laser shot, or does it run at a slower speed?

UFS December 31, 2022 No Comments

The chopper is synchronized to the laser to block every other laser pulse.

Is it possible to measure solid samples by reflection?

UFS December 31, 2022 No Comments

Yes, all our spectrometers, as well as the Microscope extension for Helios, have the reflection option.

We will be looking at both solution-based samples as well as films. Do you provide different sample holder assemblies to accommodate this?

UFS December 31, 2022 No Comments

The standard sample holder is for liquid samples and is equipped with a magnetic stirrer. An optional translating sample holder is also available. We can also offer temperature-controlled and cryostat-based…

What formulas are used to calculate absorption spectra?

UFS December 31, 2022 No Comments

To calculate single absorption spectra ΔA we register two consecutive probe pulse spectra and use the following formulas. Single Probe Channel ΔA=log10(I0 sample/Iex sample) Dual Probe Channel (Probe-Reference) ΔA= log10[(I0…

When it is useful to have a reference channel, and how it is implemented?

UFS December 31, 2022 No Comments

Which is the best probe-reference configuration and how do we normalize it to the linear absorption spectra? Basically, there is no perfect reference for the probe but there are two…

Could the HELIOS be upgraded later with the EOS capability?

UFS December 31, 2022 No Comments

Yes and many of customers have done this. For UV-VIS-NIR-SWIR Helios-Eos instruments such an upgrade doesn’t require additional table space. For Helios-Eos IR systems additional space for an excitation ns…

Can Helios and Eos both use the same detectors and software?

UFS December 31, 2022 No Comments

The Helios and the Eos use the same detectors and most of the optical elements. However, the software is completely different due to the different equipment used for the experiment.

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