Penning spectroscopy and structure of acetylene oligomers in He nanodroplets

Mandal, S and Gopal, R. and Sharma, Vandana and et al, . (2020) Penning spectroscopy and structure of acetylene oligomers in He nanodroplets. Physical Chemistry Chemical Physics, 22 (18). pp. 1-9. ISSN 1463-9076

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Abstract

Embedded atoms or molecules in a photoexcited He nanodroplet are well-known to be ionized through inter-atomic relaxation in a Penning process. In this work, we investigate the Penning ionization of acetylene oligomers occurring from the photoexcitation bands of He nanodroplets. In close analogy to conventional Penning electron spectroscopy by thermal atomic collisions, the n = 2 photoexcitation band plays the role of the metastable atomic 1s2s 3,1S He∗. This facilitates electron spectroscopy of acetylene aggregates in the sub-Kelvin He environment, providing the following insight into their structure: the molecules in the dopant cluster are loosely bound van der Waals complexes rather than forming covalent compounds. In addition, this work reveals a Penning process stemming from the n = 4 band where charge-transfer from autoionized He in the droplets is known to be the dominant relaxation channel. This allows for excited states of the remnant dopant oligomer Penning-ions to be studied. Hence, we demonstrate Penning ionization electron spectroscopy of doped droplets as an effective technique for investigating dopant oligomers which are easily formed by attachment to the host cluster. This journal is © the Owner Societies.

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IITH Creators:

IITH Creators	ORCiD
Sharma, Vandana	https://orcid.org/0000-0001-9830-2485

Item Type:

Article

Additional Information:

VS, RG and SRK are grateful to DST, India and ICTP, Trieste, for support (proposal # 20165468) to carry out this campaign at the Elettra Synchrotron facility. VS and SRK acknowledge financial support from the IMPRINT scheme. SRK thanks the Max Planck Society for supporting this research via the Partner group. MM acknowledges support from the Carlsberg Foundation, and with SRK for the funding from the SPARC Programme, MHRD, India.

Uncontrolled Keywords:

Acetylene; Atoms; Charge transfer; Drops; Electron spectroscopy; Ionization; Lighting; Molecules; Oligomers; Photoexcitation; Van der Waals forces

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

16 Nov 2022 06:29

Last Modified:

16 Nov 2022 06:29