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Kiattichart Chartkunchand

Kiattichart Chartkunchand
RIKEN | RIKEN AICS · Atomic, Molecular & Optical Physics Laboratory

Doctor of Philosophy

About

29
Publications
1,394
Reads
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138
Citations
Citations since 2016
22 Research Items
127 Citations
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
Introduction
Additional affiliations
April 2018 - present
RIKEN
Position
  • PostDoc Position
September 2017 - February 2018
Stockholm University
Position
  • PostDoc Position
September 2015 - August 2017
Stockholm University
Position
  • Researcher
Education
August 2006 - May 2015
University of Nevada, Reno
Field of study
  • Physics
August 2002 - May 2006
University of Nevada, Reno
Field of study
  • Physics

Publications

Publications (29)
Article
Full-text available
Negative ions are important in many areas of science and technology, e.g., in interstellar chemistry, for accelerator-based radionuclide dating, and in anti-matter research. They are unique quantum systems where electron-correlation effects govern their properties. Atomic anions are loosely bound systems, which with very few exceptions lack optical...
Article
Full-text available
We performed laser-induced electron detachment spectroscopy of C2- ions, produced by a cesium-sputter ion source and stored in the electrostatic ion storage ring RICE, to study highly excited states and their temporal evolution. From the observed peaks originating in the doublet–doublet transition X 2Σ+𝑔–B 2Σ+𝑢, we determined the spectroscopic cons...
Article
Full-text available
By repeatedly probing the a1Δ excited state and the X3Σ− ground-state populations in a beam of CH− ions stored in a cryogenic ion-beam storage ring for 100 s, we extract an intrinsic lifetime of 14.9±0.5 s for this excited state. This is far longer than all earlier experimental and theoretical results, exposing large difficulties in measuring and c...
Article
The A²Σ⁺–X²Π electronic transition of the nitrous oxide cation, N2O⁺, was measured via photodissociation spectroscopy in a cryogenic electrostatic ion storage ring. Rotationally resolved spectra of the N–O stretching vibrational sequence were obtained by detecting neutral N fragments produced via N2O⁺ → NO⁺ + N predissociation channels. A new set o...
Article
We study radiative cooling processes of N2O+ ions isolated in vacuum by taking advantage of the extended storage times possible with a cryogenic electrostatic ion storage ring. The temporal evolution of the internal state populations of the N2O+ ions after being stored in the ring was state-selectively measured by action spectroscopy via a predisso...
Article
Full-text available
We report the first experimental evidence of spontaneous electron emission from a homonuclear dimer anion through direct measurements of Ag2−→Ag2+e− decays on milliseconds and seconds timescales. This observation is very surprising as there is no avoided crossing between adiabatic energy curves to mediate such a process. The process is weak, yet do...
Article
Full-text available
Synopsis The decay of hot copper dimer anions is studied in a cryogenic storage ring. We detect atomic anion and neutral products and determine the fragmentation and vibrational autodetachment (VAD) rates separately. For short storage times the dimer anions predominantly decay by fragmentation of highly rotationally excited ions by tunneling throug...
Article
Full-text available
Synopsis We studied radiative cooling dynamics of the triatomic molecular ion N 2 O ⁺ stored in RICE. We observed the evolution of the populations at vibrational and rotational levels up to several 100 s by measuring neutral fragments from the laser-induced predissociation process. We found clear evidence of radiative cooling of the vibrational lev...
Article
Full-text available
Synopsis We have studied the stabilities of small carbon dianion clusters, C n 2 − (n = 7 – 11) in the cryogenic electrostatic ion storage ring, DESIREE. We observe spontaneous electron emission for tens of milliseconds, where dianions containing an even number of carbons decay slower in comparison to their neighbouring cluster sizes. For all the s...
Article
Full-text available
Synopsis A new cryogenic linear ion trap beamline has been commissioned for use with the RIKEN Cryogenic Electrostatic (RICE) storage ring. Testing of the beamline at room-temperature and cryogenic conditions was conducted using methylene blue cations MB ⁺ and carbon cluster anions C n ⁻ . Action spectroscopy measurements of pre-cooled C n ⁻ anions...
Preprint
We report the first experimental evidence of spontaneous electron emission from a homonuclear dimer anion through direct measurements of $\rm{Ag}_2^- \rightarrow \rm{Ag}_2 + \rm{e}^-$ decays on milliseconds and seconds time scales. This observation is very surprising as there is no avoided crossing between adiabatic energy curves to mediate such a...
Article
Spontaneous decays of small, hot silver-cluster anions Agn−, n=4–7, have been studied using one of the rings of the Double ElectroStatic Ion Ring ExpEriment (DESIREE). Observation of these decays over very long time scales is possible due to the very low residual gas pressure (∼10−14) and cryogenic (13 K) operation of DESIREE. The yield of neutral...
Preprint
Full-text available
Spontaneous decays of small, hot silver cluster anions Ag$_{n}$, $n=4-7$ have been studied using one of the rings of the Double ElectroStatic Ion Ring ExpEriment (DESIREE). Observation of these decays over very long time scales is possible due to the very low residual gas pressure ($\sim10^{-14}$) and cryogenic (13 K) operation of DESIREE. The yiel...
Preprint
A sputter ion source with a solid graphite target has been used to produce dianions with a focus on carbon cluster dianions, $\text{C}_{n}^{2-}$, with $n=7-24$. Singly and doubly charged anions from the source were accelerated together to kinetic energies of 10 keV per atomic unit of charge and injected into one of the cryogenic (13 K) ion-beam sto...
Article
A sputter ion source with a solid graphite target has been used to produce dianions with a focus on carbon cluster dianions, Cn2−, with n = 7–24. Singly and doubly charged anions from the source were accelerated together to kinetic energies of 10 keV per atomic unit of charge and injected into one of the cryogenic (13 K) ion-beam storage rings of t...
Conference Paper
Full-text available
We store a 10 keV OH⁻ ion-beam at 13.5 ± 0.5 K in one of the DESIREE storage rings. Using photodetachment thermometry we measure the effective relative photodetachment cross section at different storage times and determine the rotational temperature of the ions to be 13.4 ± 0.2 K in agreement with the macroscopic temperature. A model cross section...
Article
Full-text available
We apply near-threshold laser photodetachment to characterize the rotational quantum level distribution of OH− ions stored in the cryogenic ion-beam storage ring DESIREE at Stockholm University. We find that the stored ions relax to a rotational temperature of 13.4±0.2 K with 94.9±0.3% of the ions in the rotational ground state. This is consistent...
Article
Full-text available
Measurements of the radiative lifetimes of the two excited states of the platinum anion Pt⁻ are presented. Pt⁻ ions stored in the cryogenic ion storage ring DESIREE were photodetached at different photon wavelengths and the resulting yield of neutral Pt measured as a function of time was recorded. Analysis of the neutral decay curves show a 2.54 ±...
Article
Full-text available
We have measured the spontaneous neutral particle emission from copper-cluster anions (Cun−, n=3–6) stored at cryogenic temperatures in one of the electrostatic ion storage rings of the Double ElectroStatic Ion Ring ExpEriment facility at Stockholm University. The measured rate of emission from the stored Cu3− ions follows a single power-law decay...
Article
An experimental and theoretical study of the single photoionization cross section of the P⁺ cation of phosphorus is presented. Photoionization (PI) cross sections are instrumental for the determination of abundances in the interstellar medium. The experiment was performed by merging an ion beam with a photon beam. The photon beam was nearly monochr...
Article
The intrinsic radiative lifetimes of the 5d106sS1/22 and 5d96s2 D3/22 bound excited states in the platinum anion Pt− have been studied at cryogenic temperatures at the Double ElectroStatic Ion Ring Experiment (DESIREE) facility at Stockholm University. The intrinsic lifetime of the higher-lying 5d106s S1/22 state was measured to be 2.54±0.10s, whil...
Article
Full-text available
Experimental studies of the radiative lifetime of the sole excited state in the nickel anion are presented. Beams of Ni- stored in DESIREE at cryogenic temperatures were subject to photodetachment at different photon energies and the resulting neutrals collected. Preliminary analysis of the decay in neutral production yields a radiative lifetime of...
Article
Absolute single-photoionization cross sections for aluminum-like P2+ have been measured from 26.5 to 66.5 eV using photoion yield spectroscopy. In addition, absolute cross section measurements for the single-photoionization of magnesium-like P3+ have been measured from 43 to 60 eV. For both ions, the measured spectra are dominated by Rydberg series...
Article
Full-text available
Theoretical models have been developed for many decades to describe the sputtering process. These models have used various explanations to account for the mechanisms that lead to secondary ion beam production via sputtering from solid surfaces. Experimental studies of negative ion beam production, although dependent on source design and geometry, r...
Article
The technique of Velocity Map Imaging Spectroscopy (VMIS) is being adapted for the study of the heavy negative ions of the Lanthanide series. The VMIS technique will allow us to determine structural properties of these negative ions as well as yield angular distribution information for photon-negative ion interactions. An overview of the experiment...
Article
Lanthanide anions, including Lu^- and Tb^-, have been investigated at 1030 nm using a crossed laser-ion beams Laser Photodetachment Electron Spectroscopy apparatus. In the case of Lu^-, the measured spectral variation of the asymmetry parameter is shown to be consistent with p-subshell photodetachment using the simplified model of Hanstrop et. al [...
Article
Laser Photodetachment Electron Spectroscopy (LPES) has been used to study long-lived beams of the hydrogen molecular anion H2^-. A photoelectron kinetic energy spectrum was measured at the photon energy of 488 nm using an intercavity crossed laser-ion beams apparatus. The energy scale of this spectrum was calibrated using the photoelectron kinetic...
Article
In complex systems nuclear spin–lattice relaxation (NSLR) often deviates from single-exponential. The existing methods require elaborate analyses to extract the relaxation time (T1). This Letter introduces a novel approach using a standard inversion-recovery pulse segment as a filter for different components and a composite pulse to measure only th...

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