Author Topic: The difference between IETS and the second derivative of A  (Read 1682 times)

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Offline ml1019

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Dear All,

Can I know the difference between IETS and the second derivative of A?

Why are the intensity of the peaks in the attached two figures different?

Thank you for your help.

Offline Anders Blom

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Re: The difference between IETS and the second derivative of A
« Reply #1 on: November 7, 2023, 19:11 »
See https://docs.quantumatk.com/tutorials/inelastic_electron_spectrometry_au_h2_au/inelastic_electron_spectrometry_au_h2_au.html#introduction for the difference between the two in terms of how the GUI analyzer shows it. That is, IETS=(d2I/d2V) / (dI/dV).

The two versions where you divide with dI/dV or not do however seem to vary a bit in the literature and the term IETS can be used for both.

The method inelasticElectronTunnelingSpectroscopy() returns d2I/d2V as the manual states https://docs.quantumatk.com/manual/Types/InelasticTransmissionSpectrum/InelasticTransmissionSpectrum.html.
« Last Edit: November 7, 2023, 21:57 by Anders Blom »

Offline ml1019

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Re: The difference between IETS and the second derivative of A
« Reply #2 on: November 14, 2023, 00:58 »
See https://docs.quantumatk.com/tutorials/inelastic_electron_spectrometry_au_h2_au/inelastic_electron_spectrometry_au_h2_au.html#introduction for the difference between the two in terms of how the GUI analyzer shows it. That is, IETS=(d2I/d2V) / (dI/dV).

The two versions where you divide with dI/dV or not do however seem to vary a bit in the literature and the term IETS can be used for both.

The method inelasticElectronTunnelingSpectroscopy() returns d2I/d2V as the manual states https://docs.quantumatk.com/manual/Types/InelasticTransmissionSpectrum/InelasticTransmissionSpectrum.html.

Dear Anders,

Thank you for your explanation.

Best regards,
ml1019