High resolution photoelectron imaging of Au2−

León, Íker; Yang, Zhenhua; Wang, Lai-Sheng

doi:10.1063/1.4803477

Cited by 48 publications

(31 citation statements)

References 43 publications

(40 reference statements)

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“…The experiments were conducted using a high resolution PE imaging apparatus coupled to a laser vaporization supersonic cluster source, which has been described in detail previously. [36][37][38][39] Briefly clusters were produced by focusing the second harmonic of a Nd:YAG laser onto a disk target made of a mixture of Bi and isotopically enriched 10 B powders. The laser-induced plasma formed inside the nozzle was cooled by a helium carrier gas seeded with 10% argon to initiate nucleation.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Small boron clusters have been found to be planar (2D) mostly with triangular lattices decorated with tetragonal, pentagonal, or hexagonal holes, which are critical for planarity. The discovery of the planar B 36 cluster with a hexagonal hole led to the first experimental evidence of the viability of atom-thin 2D borons, named borophene, 17 which has since been synthesized as a new class of synthetic 2D material. 18 The B 40 cluster was found to have a remarkable cage structure, becoming the first all-boron fullerene (borospherene) with D 2h symmetry.…”

Section: Introductionmentioning

confidence: 99%

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High resolution photoelectron imaging of boron-bismuth binary clusters: Bi2Bn− (n = 2–4)

Cheung

Czekner

Kocheril

et al. 2019

The Journal of Chemical Physics

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Bismuth boride is a heavy member of the III-V semiconductors. Although there have been some theoretical interests in this material, it has not been synthesized experimentally. Here, we report a high-resolution photoelectron imaging study on a series of boron-bismuth binary clusters, Bi2Bn− (n = 2–4), produced by laser vaporization of a B/Bi mixed target. Vibrationally resolved photoelectron spectra are obtained for all three clusters, and the measured vibrational and electronic information is used to compare with theoretical calculations to understand their structures and bonding. Bi2B2− is found to be linear (D∞h, 2Πg) with a B2 unit and two terminal Bi atoms, while Bi2B3− is found to be planar (C2v, 1A1), consisting of a B3 triangle with two bridging Bi atoms. Interestingly, the spectra of Bi2B4− reveal two co-existing isomers; both are found to be planar and contain a rhombus B4 unit with two bridging Bi atoms in a trans (C2h, 2Au) and cis (C2v, 2B1) fashion separated only by 0.03 eV in energy. The interactions between the two Bi atoms and the Bn motifs are understood using chemical bonding analyses. This study shows that the Bi–B bonding is weak enough so that the Bn units maintain their structural integrity with the Bi atoms bonded to the cluster periphery only.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High resolution photoelectron imaging of boron-bismuth binary clusters: Bi2Bn− (n = 2–4)

Cheung

Czekner

Kocheril

et al. 2019

The Journal of Chemical Physics

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“…57 Here, the new cryogenic Paul trap and the associated more compact ion optics are briefly discussed.…”

Section: A the Third-generation Esi-pes Apparatusmentioning

confidence: 99%

Perspective: Electrospray photoelectron spectroscopy: From multiply-charged anions to ultracold anions

Wang

2015

The Journal of Chemical Physics

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Electrospray ionization (ESI) has become an essential tool in chemical physics and physical chemistry for the production of novel molecular ions from solution samples for a variety of spectroscopic experiments. ESI was used to produce free multiply-charged anions (MCAs) for photoelectron spectroscopy (PES) in the late 1990 s, allowing many interesting properties of this class of exotic species to be investigated. Free MCAs are characterized by strong intramolecular Coulomb repulsions, which create a repulsive Coulomb barrier (RCB) for electron emission. The RCB endows many fascinating properties to MCAs, giving rise to meta-stable anions with negative electron binding energies. Recent development in the PES of MCAs includes photoelectron imaging to examine the influence of the RCB on the electron emission dynamics, pump-probe experiments to examine electron tunneling through the RCB, and isomer-specific experiments by coupling PES with ion mobility for biological MCAs. The development of a cryogenically cooled Paul trap has led to much better resolved PE spectra for MCAs by creating vibrationally cold anions from the room temperature ESI source. Recent advances in coupling the cryogenic Paul trap with PE imaging have allowed high-resolution PE spectra to be obtained for singly charged anions produced by ESI. In particular, the observation of dipole-bound excited states has made it possible to conduct vibrational autodetachment spectroscopy and resonant PES, which yield much richer vibrational spectroscopic information for dipolar free radicals than traditional PES.

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“…It is, however, not clear that these are the ground state structures of the neutrals, taken the charge state dependence of the gold-cluster structures into account. By using slow-electron velocity-map imaging (SEVI) [38], transitions to single vibrational levels of Au2 and Au4 have been recently observed [39,40]. We have used photodissociation of rare-gas complexes to obtain the vibrational spectra in the far-IR [10,11].…”

Section: Introductionmentioning

confidence: 99%

Far-IR Spectra of Small Neutral Gold Clusters in the Gas Phase

Gruene

Butschke

Lyon

et al. 2014

Zeitschrift Für Physikalische Chemie

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Abstract. Vibrational spectra of small neutral gold clusters containing up to 8 Au atoms are measured in the far-infrared (46-222 cm -1 ) via photodissociation of their complexes with krypton atoms. Comparisons with calculated IR spectra for bare Aun clusters using density functional theory allow for structural assignment. For these small sizes, all clusters are found to be planar and of comparably high symmetry. For Au6 no data is available, as this cluster size is not detected in the photoionization mass spectra due to its high ionization energy. The structures assigned are for n = 4: rhombus (D2h); 5: trapezoid (C2v); 7: edge-capped triangle (Cs), 8: 4-fold edge-capped square (D4h).

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High resolution photoelectron imaging of Au2−

Cited by 48 publications

References 43 publications

High resolution photoelectron imaging of boron-bismuth binary clusters: Bi2Bn− (n = 2–4)

High resolution photoelectron imaging of boron-bismuth binary clusters: Bi2Bn− (n = 2–4)

Perspective: Electrospray photoelectron spectroscopy: From multiply-charged anions to ultracold anions

Far-IR Spectra of Small Neutral Gold Clusters in the Gas Phase

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