Abstract
Absolute differential and integral cross sections (DCSs and ICSs) for the lowest-lying singlet excitations in ammonia (NH3) molecules have been measured from near threshold to 400 eV using angle-revolved electron energy loss spectroscopy. Normalizing the angular distributions of inelastically scattered electrons to the absolute DCS of He as the reference, the reliable absolute cross sections for the \(\widetilde{A}{}^{1}{A^{\prime\prime}}_{2}\) excitation were obtained in a wider impact energy range. The BEf-scaled ICS was also derived as a function of incident electron energy from the generalized oscillator strengths analysis using the corresponding DCS measured at higher impact energies. The experimental ICS of the singlet excitation in the present study has reasonably reproduced the BEf-scaled ICS in the energy of not only higher impact energies but also near the threshold energy within the experimental uncertainties. The present absolute measurement has suggested that the BEf-scaling law was confirmed to be quite useful to NH3 molecules even towards the threshold energy.
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The manuscript has no associated data, or the data will not be deposited. [Authors’ comment: Our excitation cross section data are available from the corresponding author on reasonable request.]
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Acknowledgements
Prof. M. J. Brunger was a leader within the electron scattering community to which he has made several relevant contributions. He was a researcher of considerable accomplishment. We are deeply grateful to the late Prof. M. Brunger for the many encouragement discussions under the fruitful collaboration we have kept with him for many years. This work was partly supported by the Grant-in-Aid for Scientific Research (C) (KAKENHI) Grant Number JP19K03812. PLV acknowledges the Portuguese National Funding Agency (FCT) through CEFITEC (UIDB/00068/2020) grant as well as his visiting professor position at Sophia University, Tokyo, Japan.
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Hoshino, M., Yodo, A., Limão-Vieira, P. et al. Experimental and BEf-scaled cross sections for electron-impact excitation of ammonia molecules from near threshold to high-intermediate energy. Eur. Phys. J. D 77, 147 (2023). https://doi.org/10.1140/epjd/s10053-023-00728-z
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DOI: https://doi.org/10.1140/epjd/s10053-023-00728-z