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Min, Ahreum,Moon, Cheol Joo,Ahn, Ahreum,Lee, Ji Hoon,Kim, Seong Keun,Choi, Myong Yong Elsevier 2016 Chemical physics letters Vol.658 No.-
<P>Mass-selected resonant two-photon ionization (R2PI) and UV-UV hole-burning, and infrared-dip spectra of 5-cyanoindole (5CI) and its water clusters, 5CI-(H2O)(n) (n =1 and 2) were measured. Although, the structures of 5CI-(H2O)(1-2) are similar to those of 3CI-(H2O)1-2, the photofragmentation behaviors of the two systems are quite different due to the L-a-L-b state energy lowering and higher binding energies of 5CI-(H2O)(1-2) compared to those of 3CI-(H2O)(1-2). Especially for the case of 50-(I-120)2 cluster, shortening excited-state lifetime of 5CI-(H2O)(2) causes the broad background in the R2PI spectrum of 5CI-(H2O)(2). (C) 2016 Elsevier B.V. All rights reserved.</P>
Spectroscopic and theoretical studies of jet‐cooled 3‐cyanoindole ammonia clusters in the gas phase
Min Ahreum,Kim Jiwon,Moon Cheol Joo,Ahn Ahreum,Park Juhyeon,Choi Myong Yong 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.5
The structural information of 3-cyanoindole ammonia cluster, 3CI (NH3)1, in molecular beams was investigated in the gas phase. We obtained UV–UV holeburning spectrum (UV–UV HB) to determine the number of conformers present in the molecular beams and examine their spectral features. As a result, single conformer of 3CI (NH3)1 was observed in the mass-selected one-color resonant two-photon ionization (1C-R2PI) spectroscopy. The origin band of 3CI (NH3)1 in the R2PI spectrum is redshifted by 122 and 71 cm1 compared to those of the 3CI monomer and 3CI 1:1 water cluster, 3CI (H2O)1, respectively. The fully optimized geometries, relative energies, transition energies, binding energies, and electrostatic potential (ESP) of the 3CI monomer, 3CI (H2O)1, and 3CI (NH3)1 clusters were calculated at the B3LYP and TD-B3LYP methods with the 6-311++(d,p) basis set. The observed spectra are compared with the predictions of time-dependent density functional theory calculations.
이아름(Ahreum Lee),유진수(Jinsu Yoo),박성은(Sungeun Park),박주형(Joo Hyung Park),안승규(Seungkyu Ahn),조준식(Jun-Sik Cho) 한국태양광발전학회 2021 Current Photovoltaic Research Vol.9 No.4
Silicon heterojunction technology (HJT) solar cells have received considerable attention due to advantages that include high efficiency over 26%, good performance in the real world environment, and easy application to bifacial power generation using symmetric device structure. Furthermore, ultra-highly efficient perovskite/c-Si tandem devices using the HJT bottom cells have been reported. In this paper, we discuss the unique feature of the HJT solar cells, the fabrication processes and the current status of technology development. We also investigate practical challenges and key technologies of the HJT solar cell manufacturers for reducing fabrication cost and increasing productivity.
송우근,Suyeon Ahn,Ahreum Kwon,Youngsoo Oh,이상명 한국분자세포생물학회 2023 Molecules and cells Vol.46 No.6
Microtubule acetylation has been proposed as a marker of highly heterogeneous and aggressive triple-negative breast cancer (TNBC). The novel microtubule acetylation inhibitors GM-90257 and GM-90631 (GM compounds) cause TNBC cancer cell death but the underlying mechanisms are currently unknown. In this study, we demonstrated that GM compounds function as anti-TNBC agents through activation of the JNK/AP-1 pathway. RNA-seq and biochemical analyses of GM compound-treated cells revealed that c-Jun N-terminal kinase (JNK) and members of its downstream signaling pathway are potential targets for GM compounds. Mechanistically, JNK activation by GM compounds induced an increase in c-Jun phosphorylation and c-Fos protein levels, thereby activating the activator protein-1 (AP-1) transcription factor. Notably, direct suppression of JNK with a pharmacological inhibitor alleviated Bcl2 reduction and cell death caused by GM compounds. TNBC cell death and mitotic arrest were induced by GM compounds through AP-1 activation in vitro. These results were reproduced in vivo, validating the significance of microtubule acetylation/JNK/AP-1 axis activation in the anti-cancer activity of GM compounds. Moreover, GM compounds significantly attenuated tumor growth, metastasis, and cancer-related death in mice, demonstrating strong potential as therapeutic agents for TNBC.
Lee, Seulki,Ahn, Ahreum,Choi, Myong Yong The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.45
<P>An Al metal plate was ablated by a pulsed Nd–YAG laser to produce nano-structured Al and gamma-Al<SUB>2</SUB>O<SUB>3</SUB> in deionized water without any surfactants or catalysts. In this study, direct evidence for the production of Al<SUP>3+</SUP> ions from the plasma plume is presented for the first time by characterizing the absorption and emission spectra of their [Al(salophen)]<SUP>+</SUP> complex. Very interestingly, a remarkable increase in the fluorescence intensity was observed when the Al<SUP>3+</SUP> ions, produced <I>via</I> the pulsed laser ablation, complexed with the salophen ligand. This fluorescence ‘turn-on’ behaviour of [Al(salophen)]<SUP>+</SUP> was investigated by DFT/TD-DFT calculations. Based on these results, mechanisms for the production of aluminium and alumina nanoparticles in the pulsed laser ablation in liquid (PLAL) process are proposed.</P> <P>Graphic Abstract</P><P>Here we report the direct evidence for the production of Al<SUP>3+</SUP> ions during the pulsed laser ablation in liquid for the first time by characterizing the absorption and emission spectra of their [Al(salophen)]<SUP>+</SUP> complex. Very interestingly, a remarkable increase in the fluorescence intensity was observed when the Al<SUP>3+</SUP> ions, produced <I>via</I> the pulsed laser ablation, complexed with the salophen ligand. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp42463k'> </P>
Vacuum Non-Vacuum Hybrid Process for Cu(In,Ga)Se₂ Thin Film Solar Cell
Yun-Ae Cho,SeJin Ahn,Ara Cho,Jihye Gwak,Seung Kyu Ahn,Jun Sik Cho,Joo Hyung Park,Jin Soo Yoo,Kihwan Kim,Donghyeop Shin,In-Young Jeong,Jae Ho Yun,Soomin Song,Sang-Min Lee,Ahreum Lee,Young-Joo Eo 한국신재생에너지학회 2019 AFORE Vol.2019 No.11
Conformationally resolved structures of jet-cooled acetaminophen by UV–UV hole-burning spectroscopy
Lee, Seung Jun,Min, Ahreum,Kim, Yusic,Ahn, Ahreum,Chang, Jinyoung,Lee, Sang Hak,Choi, Myong Yong,Kim, Seong Keun Royal Society of Chemistry 2011 Physical chemistry chemical physics Vol.13 No.37
<P>The conformational structures of jet-cooled acetaminophen were investigated in the gas phase by resonant 2-photon ionization and UV–UV hole-burning spectroscopy. In contrast to the results from a previous study, two nearly isoenergetic conformers were distinctly found in a supersonic molecular beam expansion and positively identified as the <I>cis</I> and <I>trans</I> isomers of acetaminophen by UV–UV hole-burning spectroscopy. The 0–0 bands of the <I>cis</I> and <I>trans</I> isomers were found at 33518.7 and 33485.6 cm<SUP>−1</SUP>, respectively. The vibronic bands of the two isomers are close-lying and/or partially overlapping due to the small energy difference (33 cm<SUP>−1</SUP>) between the two 0–0 bands. As a consequence, the recorded resonant 2-photon ionization spectrum is highly congested in the low excitation energy region, which develops continuously into a featureless, broadened spectrum in the high energy region.</P> <P>Graphic Abstract</P><P>Two ground state conformational isomers of acetaminophen, paracetamol, in its <I>cis</I>- and <I>trans</I>- forms, have been clearly and positively identified. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cp21999e'> </P>
Fabrication of the CuInGaSe Pellet and Characterization of the Thin Film
Jeon, Hunsoo,Lee, Ahreum,Lee, Gang-Seok,Jo, Dong-Wan,Ok, Jin-Eun,Kim, Kyoung Hwa,Yang, Min,Yi, Sam Nyung,Ahn, Hyung Soo,Cho, Chae-Ryong,Kim, Suck-Whan,Ha, Hong-Ju IOP Publishing 2011 Japanese journal of applied physics Vol.50 No.1