Photoelectron-Photofragment Coincidence Spectroscopy With Ions Prepared in a Cryogenic Octopole Accumulation Trap: Collisional Excitation and Buffer Gas Cooling

Shen, Ben B.; Lunny, Katharine G.; Benitez, Yanice; Continetti, Robert E.

doi:10.3389/fchem.2019.00295

Title: Photoelectron-Photofragment Coincidence Spectroscopy With Ions Prepared in a Cryogenic Octopole Accumulation Trap: Collisional Excitation and Buffer Gas Cooling

Journal Article · Tue Apr 30 00:00:00 EDT 2019 · Frontiers in Chemistry

DOI:https://doi.org/10.3389/fchem.2019.00295· OSTI ID:1509921

Shen, Ben B.; Lunny, Katharine G.; Benitez, Yanice; Continetti, Robert E.

A cryogenic octopole accumulation trap (COAT) has been coupled to a photoelectron-photofragment coincidence (PPC) spectrometer allowing for improved control over anion vibrational excitation. The anions are heated and cooled via collisions with buffer gas <17 K. Shorter trapping times (500 μs) prevent thermalization and result in anions with high internal excitation while longer trapping times (80 ms) at cryogenic temperatures thermalize the ions to the temperature of the buffer gas. The capabilities of the COAT are demonstrated using PPC spectroscopy of O-3 at 388 nm (Ehν = 3.20 eV). Cooling the precursor anions with COAT resulted in the elimination of the autodetachment of vibrationally excited O-2 produced by the photodissociation O-3 + hν → O + O-2(v ≥ 4). Under heating conditions, a lower limit temperature for the anions was determined to be 1,500 K through Franck-Condon simulations of the photo-detachment spectrum of O-3, considering a significant fraction of the ions undergo photodissociation in competition with photo-detachment. The ability to cool or heat ions by varying ion injection and trapping duration in COAT provides a new flexibility for studying the spectroscopy of cold ions as well as thermally activated processes.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: FG03-98ER14879

OSTI ID:: 1509921

Alternate ID(s):: OSTI ID: 1614602; OSTI ID: 1755314

Journal Information:: Frontiers in Chemistry, Journal Name: Frontiers in Chemistry Vol. 7; ISSN 2296-2646

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: Switzerland

Language:: English

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Cited by: 2 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
Chemistry
ion trap
ozonide
photoelectron
photofragment
coincidence spectroscopy
collisional excitation
buffer gas cooling
ozone
photodetachment
radiofrequency octopole ion trap
radiofrequency octopole ion trap
buffer gas cooling
ozonide
photodetachment

Title: Photoelectron-Photofragment Coincidence Spectroscopy With Ions Prepared in a Cryogenic Octopole Accumulation Trap: Collisional Excitation and Buffer Gas Cooling

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