Photoelectron Angular Distributions as Probes of Cluster Anion Structure: I–·(H2O)2 and I–·(CH3CN)2

Mbaiwa, Foster; Holtgrewe, Nicholas; Dao, Diep; Lasinski, Joshua; Mabbs, Richard

doi:10.1021/jp4104596

Cited by 3 publications

(2 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Photofragment action spectroscopy in conjunction with TRPES has identified autodetachment as well as formation of I − as the major cluster decay pathways in both photoexcitation regimes for I − •U binary clusters, 26 although the nature of the time-resolved dynamics of these channels has been found to be clearly different for each set of pump energies. 27 Autodetachment refers to the spontaneous emission of an electron from photoexcitation of an anion resonance embedded within the neutral plus free electron continuum; [39][40][41] these electrons can be very slow if randomization of vibrational energy occurs prior to electron emission (the thermionic emission limit). 42 In the present study, we employ TRPES to excite I − •U•H2O complexes near the peak of the base-centered π-π* excitation 32 at 260 nm (4.77 eV), and track the resulting dynamics with 1.58 eV or 3.18 eV probe pulses.…”

Section: Trpes Of I − •N Clusters Probes the Dynamics Of Photoinducedmentioning

confidence: 99%

Time-resolved dynamics in iodide-uracil-water clusters upon excitation of the nucleobase

Kunin

McGraw

Lunny

et al. 2019

The Journal of Chemical Physics

View full text Add to dashboard Cite

The dynamics of iodide-uracil-water (I − •U•H2O) clusters following π-π* excitation of the nucleobase are probed using time-resolved photoelectron spectroscopy (TRPES). Photoexcitation of this cluster at 4.77 eV results in electron transfer from the iodide moiety to the uracil, creating a valence-bound (VB) anion within the cross-correlation of the pump and probe laser pulses. This species can decay by a number of channels, including autodetachment and dissociation to I − or larger anion fragments. Comparison of the energetics of the photoexcited cluster and its decay dynamics with those of the bare iodide-uracil (I − •U) complex provide a sensitive probe of the effects of microhydration on these species.

show abstract

Section: Trpes Of I − •N Clusters Probes the Dynamics Of Photoinducedmentioning

confidence: 99%

Time-resolved dynamics in iodide-uracil-water clusters upon excitation of the nucleobase

Kunin

McGraw

Lunny

et al. 2019

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…In and of themselves, ion–molecule complexes (IMCs) have historically inspired active scientific exploration because of their importance in gas-phase reactions and photochemistry, − the properties and dynamics in aqueous electrolytic solutions, − and physical processes in planetary atmospheres. − Negatively charged complexes in particular have proven to be fertile ground for study using mass-selective photodetachment spectroscopies, with fundamental physical insights on the anions and their associated neutrals pouring from the laboratories engaged in these studies. − These species, like cationic IMCs, can accumulate numerous neutral molecules, forming noncovalently bound clusters, a topic explored in a recent review by Sanov …”

Section: Introductionmentioning

confidence: 99%

Probing Anion–Molecule Complexes of Atmospheric Relevance Using Anion Photoelectron Detachment Spectroscopy

Jarrold

2022

ACS Phys. Chem Au

View full text Add to dashboard Cite

Bimolecular reaction and collision complexes that drive atmospheric chemistry and contribute to the absorption of solar radiation are fleeting and therefore inherently challenging to study experimentally. Furthermore, primary anions in the troposphere are short lived because of a complicated web of reactions and complex formation they undergo, making details of their early fate elusive. In this perspective, the experimental approach of photodetaching mass-selected anion–molecule complexes or complex anions, which prepares neutrals in various vibronic states, is surveyed. Specifically, the application of anion photoelectron spectroscopy along with photoelectron–photofragment coincidence spectroscopy toward the study of collision complexes, complex anions in which a partial covalent bond is formed, and radical bimolecular reaction complexes, with relevance in tropospheric chemistry, will be highlighted.

show abstract

Communication: Evidence for dipole-bound excited states in gas-phase I− ⋅ MI (M = Na, K, Cs) anionic salt microclusters

Harvey

Yoshikawa

Wang

et al. 2015

The Journal of Chemical Physics

View full text Add to dashboard Cite

We report the first UV laser photodissociation spectra of gas-phase I(-) ⋅ MI (M = Na, K, Cs) alkali halide anionic microclusters. The photodepletion spectra of these clusters display strong absorption bands just below the calculated vertical detachment energies, indicative of the presence of dipole-bound excited states. Photoexcitation at the peak of the transition to the dipole-bound excited state results in production of a primary [MI](-) photofragment along with a less intense I(-) ion. The photofragmentation mechanism of the excited state cluster is discussed in the context of an initial dipole-bound excited state that subsequently relaxes via a vibrational Feschbach resonance. The experiments described have been performed in an electrospray source laser-interfaced quadrupole ion-trap instrument and demonstrated for the first time that dipole-bound excited states can be identified in the relatively high-collision environment of a quadrupole ion-trap, in particular for systems with large dipole moments associated with the presence of charge separation. This indicates considerable potential for future experiments that identify dipole-bound excited states as a "low-resolution" structural probe of biomolecules and molecular charge separation using the instrumentation employed in this work.

show abstract

Photoelectron Angular Distributions as Probes of Cluster Anion Structure: I^–·(H₂O)₂ and I^–·(CH₃CN)₂

Cited by 3 publications

References 39 publications

Time-resolved dynamics in iodide-uracil-water clusters upon excitation of the nucleobase

Time-resolved dynamics in iodide-uracil-water clusters upon excitation of the nucleobase

Probing Anion–Molecule Complexes of Atmospheric Relevance Using Anion Photoelectron Detachment Spectroscopy

Communication: Evidence for dipole-bound excited states in gas-phase I− ⋅ MI (M = Na, K, Cs) anionic salt microclusters

Contact Info

Product

Resources

About