1. H. Fukuzawa, RR. Lucchese, XJ. Liu, K. Sakai, H. Iwayama, K. Nagaya, K. Kreidi, MS. Schoffler, JR. Harries, Y. Tamenori, Y. Morishita, IH, Suzuki, N. Saito, K. Ueda
   JOURNAL OF CHEMICAL PHYSICS 150 (2019) 174306
   DOI:10.1063/1.5091946
2. H. Iwayama, JR. Harries
   "Resonant-Auger-state-selected dissociation dynamics and dissociation limits of N 1s ->pi(* )core excited N-2 molecules studied using a two-dimensional Auger-electron-photoion coincidence method"
   JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA 232 (2019) 40
   DOI:10.1016/j.elspec.2019.01.005
3. K. Fuchizaki, T. Sakagami, H. Iwayama
   "Pressure-induced local symmetry breaking upon liquid-liquid transition of GeI4 and SnI4"
   JOURNAL OF CHEMICAL PHYSICS 150 (2019) 114501
   DOI:10.1063/1.5061714

1. JR. Harries, H. Iwayama, S. Kuma, M. Iizawa, N, Suzuki, Y. Azuma, S. Owada, T. Togashi, K. Tono, M. Yabashi, E. Shigemasa
   "Superfluorescence, Free-Induction Decay, and Four-Wave Mixing: Propagation of Free-Electron Laser Pulses through a Dense Sample of Helium Ions"
   PHYSICAL REVIEW LETTERS 121 (2018) 263201
   DOI:10.1103/PhysRevLett.121.263201

1. H. Iwayama, C. Leonard, F. Le Quere, S. Carniato, R. Guillemin, M. Simon, MN Piancastelli, E. Shigemasa
   "Different Time Scales in the Dissociation Dynamics of Core-Excited CF4 by Two Internal Clocks"
   PHYSICAL REVIEW LETTERS 119 (2017) 203203
   DOI:10.1103/PhysRevLett.119.203203
2. T. Kaneyasu, Y. Hikosaka, M. Fujimoto, H. Iwayama, M. Hosaka, E. Shigemasa, M. Katoh
   "Observation of an optical vortex beam from a helical undulator in the XUV region"
   JOURNAL OF SYNCHROTRON RADIATION 24 (2017) 934
   DOI:10.1107/S1600577517009626
3. T. Kaneyasu, Y. Hikosaka, M. Fujimoto, T. Konomi, M. Katoh, H. Iwayama, E. Shigemasa
   "Limitations in photoionization of helium by an extreme ultraviolet optical vortex"
   PHYSICAL REVIEW A 95 (2017) 023413
   DOI:10.1103/PhysRevA.95.023413
4. T. Ouchi, V. Stump, T. Miteva, H. Fukuzawa, K. Sakai, XJ. Liu, T. Mazza, M. Schoffler, H. Iwayama, K. Nagaya, Y. Tamenori, N. Saito, A. Kuleft, K. Gokhberg, K. Ueda
   "Ion pair formation in the NeAr dimer irradiated by monochromatic soft X-rays"
   CHEMICAL PHYSICS 482 (2017) 178.
   DOI:10.1016/j.chemphys.2016.09.032

1. JR. Harries, C. Ohae, S. Kuma, K. Nakajima, T. Togashi, Y. Miyamoto, N. Sasao, H. Iwayama, M. Nagasono, M. Yabashi, E. Shigemasa
   "Single-atom response of helium atoms to pulses from an EUV free-electron laser: Implications for the subsequent development of superfluorescence"
   PHYSICAL REVIEW A 94 (2016) 063416.
   DOI:10.1103/PhysRevA.94.063416
2. H. Iwayama, T. Kaneyasu, Y. Hikosaka, E. Shigemasa
   "Stability and dissociation dynamics of N2++ ions following core ionization studied by an Auger-electron–photoion coincidence method"
   JOURNAL OF CHEMICAL PHYSICS 145 (2016) 034305.
   DOI:10.1063/1.4958620
3. O. Travnikova, T. Marchenko, G. Goldsztejn, K. Jänkälä, N. Sisourat, S. Carniato, R. Guillemin, L. Journel, D. Céolin, R. Püttner, H. Iwayama, E. Shigemasa, M.N. Piancastelli, M. Simon
   "Hard-X-Ray-Induced Multistep Ultrafast Dissociation"
   PHYSICAL REVIEW LETTERS 116 (2016) 213001.
   DOI:10.1103/PhysRevLett.116.213001

C. Ohae, JR. Harries, H. Iwayama, K. Kawaguchi, S. Kuma, Y. Miyamoto, M. Nagasono, K. Nakajima, I. Nakano, E. Shigemasa, N. Sasao, S. Uetake, T. Wakabayashi, A. Yoshimi, K. Yoshimura M. Yoshimura
"Simultaneous Measurements of Superradiance at Multiple Wavelength from Helium Excited States: II. Analysis"
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 85 (2016) 034301.
DOI:10.7566/JPSJ.85.034301

1. F. Penent, M. Nakano, M. Tashiro, TP.Grozdanov, M. Zitnik, K. Bucar, S. Carniato, P. Selles, L. Andric, P. Lablanquie, J. Palaudoux, E. Shigemasa, H. Iwayama, Y. Hikosaka, K. Soejima, IH. Suzuki, N. Berrah, AH. Wuosmaa, T. Kaneyasu, K. Ito
   "Double core hole spectroscopy with synchrotron radiation"
   JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA 204 (2015) 303.
   DOI:10.1016/j.elspec.2015.06.015
2. Y. Hikosaka, T. Kaneyasu, P. Lablanquie, F. Penent, E. Shigemasa, K. Ito
   "Multiple Auger decay of the neon 1s-core-hole state studied by multielectron coincidence spectroscopy"
   PHYSICAL REVIEW A 92 (2015) 033413
   DOI:10.1103/PhysRevA.92.033413
3. T. Kaneyasu, M. Ito, K. Soejima, Y. Hikosaka, E. Shigemasa
   "Site-specific formation of metastable OCS2+ studied by Auger-electron-ion coincidence method"
   JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 48 (2015) 125101
   DOI:10.1088/0953-4075/48/12/125101
4. JR. Harries, H. Iwayama, M. Nagasono, T. Togashi, M. Yabashi, S. Kuma, K. Nakajima, Y. Miyamoto, C. Ohae, N. Sasao, E. Shigemasa
   "A streak camera study of superfluorescence at multiple wavelengths from helium atoms excited using free electron laser pulses"
   JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 48 (2015) 105002.
   DOI:10.1088/0953-4075/48/10/105002
5. K. Nakajima, JR. Harries, H. Iwayama, S. Kuma, Y. Miyamoto, M. Nagasono, C. Ohae, T. Togashi, M. Yabashi, E. Shigemasa, N. Sasao
   "Simultaneous Measurements of Super-Radiance at Multiple Wavelengths from Helium Excited States: I. Experiment"
   JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 84 (2015) 054301.
   DOI:10.7566/JPSJ.84.054301

H. Iwayama, JR. Harries, E. Shigemasa
"Transient charge dynamics in argon-cluster nanoplasmas created by intense extreme-ultraviolet free-electron-laser irradiation"
PHYSICAL REVIEW A 91 (2015) 021402.
DOI:10.1103/PhysRevA.91.021402

1. Y. Hikosaka, M. Fushitani, A. Matsuda, T. Endo, Y. Toida, E. Shigemasa, M. Nagasono, K. Tono, T. Togashi, M. Yabashi, T. Ishikawa, A. Hishikawa
   "Five-photon sequential double ionization of He in intense extreme-ultraviolet free-electron laser fields"
   PHYSICAL REVIEW A 90 (2014) 053403.
   DOI:10.1103/PhysRevA.90.053403
2. F. Penent, M. Nakano, M. Tashiro, TP. Grozdanov, M. Zitnik, S. Carniato, P. Selles, L. Andric, P. Lablanquie, J. Palaudoux, E. Shigemasa, H. Iwayama, Y. Hikosaka, K. Soejima, IH. Suzuki, N. Kouchi, K. Ito
   "Molecular single photon double K-shell ionization"
   JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA 196 (2014) 38.
   DOI:10.1016/j.elspec.2013.10.002
3. P. Lablanquie, H. Iwayama, F. Penent, K. Soejima, E. Shigemasa
   "Lifetime broadening of atomic lines produced upon ultrafast dissociation of HCl and HBr"
   JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA 195 (2014) 96.
   DOI:10.1016/j.elspec.2014.06.006
4. T. Gejo, T. Ikegami, K. Honma, O. Takahashi, E. Shigemasa, Y. Hikosaka, Y. Tamenori
   "Dynamics of oxygen Rydberg atom generation following O 1s inner-shell excitation of H2O"
   JOURNAL OF CHEMICAL PHYSICS 140 (2014) 214310.
   DOI:10.1063/1.4880557
5. Y. Hikosaka, Y. Shibata, K. Soejima, H. Iwayama, E. Shigemasa
   "Site-specific formation of metastable dications following inner-shell ionization of CO2"
   CHEMICAL PHYSICS LETTERS 603 (2014) 46.
   DOI:10.1016/j.cplett.2014.04.030
6. Y. Hikosaka, P. Lablanquie, F. Penent, P. Selles, E. Shigemasa, K. Ito
   "Resonant multiple Auger decay after the 2p(3/2)(-1) 4s excitation in Ar studied with a multielectron coincidence method"
   PHYSICAL REVIEW A 89 (2014) 023410.
   DOI:10.1103/PhysRevA.89.023410

Y. Hikosaka, M. Sawa, K. Soejima, E. Shigemasa
"A high-resolution magnetic bottle electron spectrometer and its application to a photoelectron-Auger electron coincidence measurement of the L2,3VV Auger decay in CS2"
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA 192 (2014) 69.
DOI:10.1016/j.elspec.2014.01.017

1. M. Fushitani, Y. Hikosaka, A. Matsuda, T. Endo, E. Shigemasa, M. Nagasono, T. Sato, T. Togashi, M. Yabashi, T. Ishikawa, A. Hishikawa
   "Nonresonant EUV-UV two-color two-photon ionization of He studied by single-shot photoelectron spectroscopy"
   PHYSICAL REVIEW A 88 (2013) 063422.
   DOI:10.1103/PhysRevA.88.063422
2. M. Nakano, P. Selles, P. Lablanquie, Y. Hikosaka, F. Penent, E. Shigemasa, K. Ito, S. Carniato
   "Near-Edge X-Ray Absorption Fine Structures Revealed in Core Ionization Photoelectron Spectroscopy"
   PHYSICAL REVIEW LETTERS 111 (2013) 123001.
   DOI:10.1103/PhysRevLett.111.123001
3. JR. Harries, M. Nagasono, H. Iwayama, E. Shigemasa
   "Towards coherent control of SASE pulses using propagation through helium gas at wavelengths corresponding to double excitation"
   JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 46 (2013) 164021.
   DOI:10.1088/0953-4075/46/16/164021
4. E. Shigemasa, M. Nagasono, H. Iwayama, JR. Harries, L. Ishikawa
   "Resonance-enhanced three-photon single ionization of Ne by ultrashort extreme-ultraviolet pulses"
   JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 46 (2013) 164020.
   DOI:10.1088/0953-4075/46/16/164020
5. M Yabashi, H. Tanaka, T. Tanaka, H. Tomizawa, T. Togashi, M. Nagasono, T. Ishikawa, JR. Harries, Y. Hikosaka, A. Hishikawa, K. Nagaya, N. Saito, E. Shigemasa K. Yamanouchi, K. Ueda
   "Compact XFEL and AMO sciences: SACLA and SCSS"
   JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 46 (2013) 164001.
   DOI:10.1088/0953-4075/46/16/164001
6. Y. Hikosaka, M. Fushitani, A. Matsuda, T. Endo, Y. Toida, E. Shigemasa, M. Nagasono, K. Tono, T. Togashi, M. Yabashi, T. Ishikawa, A. Hishikawa
   "Resonances in three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields studied by shot-by-shot photoelectron spectroscopy"
   PHYSICAL REVIEW A 88 (2013) 023421.
   DOI:10.1103/PhysRevA.88.023421
7. MN. Piancastelli, R. Guillemin, M. Simon, H. Iwayama, E. Shigemasa
   "Ultrafast dynamics in C 1s core-excited CF4 revealed by two-dimensional resonant Auger spectroscopy"
   JOURNAL OF CHEMICAL PHYSICS 138 (2013) 234305.
   DOI:10.1063/1.4810871
8. M. Nakano, F. Penent, M. Tashiro, TP. Grozdanov, M. Zitnik, S. Carniato, P. Selles, L. Andric, P. Lablanquie, J. Palaudoux, E. Shigemasa, H. Iwayama, Y. Hikosaka, K. Soejima, IH. Suzuki, N. Kouchi, K. Ito
   "Single Photon K-2 and K-1K-1 Double Core Ionization in C2H2n (n=1-3), CO, and N-2 as a Potential New Tool for Chemical Analysis"
   PHYSICAL REVIEW LETTERS 110 (2013) 163001.
   DOI:10.1103/PhysRevLett.110.163001
9. SM. Huttula, P. Lablanquie, L. Andric, J. Palaudoux, M. Huttula, S. Sheinerman, E. Shigemasa, Y. Hikosaka, K. Ito, F. Penent
   "Decay of a 2p Inner-Shell Hole in an Ar+ Ion"
   PHYSICAL REVIEW LETTERS 110 (2013) 113002.
   DOI:10.1103/PhysRevLett.110.113002
10. E. Kawerk, S. Carniato, H. Iwayama, E. Shigemasa, MN. Piancastelli, J. Wassaf, A. Khoury, M. Simon
    "Experimental and theoretical study of X-ray absorption around the chlorine L edge in vinyl chloride"
    JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA 186 (2013) 1.
    DOI:10.1016/j.elspec.2013.01.018

H. Iwayama, N. Sisourat, P. Lablanquie, F. Penent, J. Palaudoux, L. Andric, J.H.D, Eland, K. Buar, M. Zitnik, Y. Velkov, Y. Hikosaka, M. Nakano, E. Shigemasa
“A local chemical environment effect in site-specific Auger spectra of ethyl trifluoroacetate”
Journal of Chemical Physics, 138 (2013) 024306.
DOI:10.1063/1.4773294

1. H. Iwayama, M. Nagasono, J.R. Harries, E. Shigemasa
   "Demonstration of up-conversion fluorescence from Ar clusters in intense free-electron-laser fields"
   Optics Express, 20 (2012) 23174.
   DOI:10.1364/OE.20.023174
2. T. Gejo, T. Tamura, K. Honma, E. Shigemasa, Y. Hikosaka, Y. Tamenori
   "Angle-resolved metastable fragment yields spectra of N-2 and CO in K-edge excitation energy region"
   JOURNAL OF CHEMICAL PHYSICS 136 (2012) 054201.
   DOI:10.1063/1.3680561

E. Shigemasa, N. Kosugi
"MOLECULAR INNER-SHELL SPECTROSCOPY. ARPIS TECHNIQUE AND ITS APPLICATIONS"
ADVANCES IN CHEMICAL PHYSICS 147 (2012) 75

1. A. Hishikawa, M. Fushitani, Y. Hikosaka, A. Matsuda, CN. Liu, T. Morishita, E. Shigemasa, M. Nagasono, K. Tono, T. Togashi, H. Ohashi, H. Kimura, Y. Senba, M. Yabashi, T. Ishikawa
   "Enhanced Nonlinear Double Excitation of He in Intense Extreme Ultraviolet Laser Fields"
   PHYSICAL REVIEW LETTERS 107 (2011) 243003.
   DOI:10.1103/PhysRevLett.107.243003
2. P. Lablanquie, TP. Grozdanov, M. Zitnik, S. Carniato, P. Selles, L. Andric, J. Palaudoux, F. Penent, H. Iwayama, E. Shigemasa, Y. Hikosaka, K. Soejima, M. Nakano, IH. Suzuki, K. Ito
   "Evidence of Single-Photon Two-Site Core Double Ionization of C2H2 Molecules"
   PHYSICAL REVIEW LETTERS 107 (2011) 193004.
   DOI: 10.1103/PhysRevLett.107.193004
3. M. Nagasono, JR. Harries, H. Iwayama, T. Togashi, K. Tono, M. Yabashi, Y. Senba, H. Ohashi, T. Ishikawa, E. Shigemasa
   "Observation of Free-Electron-Laser-Induced Collective Spontaneous Emission (Superfluorescence)"
   PHYSICAL REVIEW LETTERS 107 (2011) 193603.
   DOI:10.1103/PhysRevLett.107.193603
4. Y. Hikosaka, P. Lablanquie, F. Penent, J. Palaudoux, L. Andric, K. Soejima, E. Shigemasa, IH. Suzuki, M. Nakano, K. Ito
   "Energy Correlation among Three Photoelectrons Emitted in Core-Valence-Valence Triple Photoionization of Ne"
   PHYSICAL REVIEW LETTERS 107 (2011) 113005.
   DOI:10.1103/PhysRevLett.107.113005
5. IH. Suzuki, Y. Hikosaka, E. Shigemasa, P. Lablanquie, F. Penent, K. Soejima, M. Nakano, N. Kouchi, K. Ito
   "Decay pathways after Xe 3d inner shell ionization using a multi-electron coincidence technique"
   JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 44 (2011) 075003.
   DOI:10.1088/0953-4075/44/7/075003
6. P. Lablanquie, F. Penent, J. Palaudoux, L. Andric, P. Selles, S. Carniato, K. Bucar, M. Zitnik, M. Huttula, JHD. Eland, E. Shigemasa, K. Soejima, Y. Hikosaka, IH. Suzuki, M. Nakano, K. Ito
   "Properties of Hollow Molecules Probed by Single-Photon Double Ionization"
   PHYSICAL REVIEW LETTERS 106 (2011) 063003.
   DOI:10.1103/PhysRevLett.106.063003

P. Lablanquie, SM. Huttula, M. Huttula, L. Andric, J. Palaudoux, JHD. Eland, Y. Hikosaka, E. Shigemasa, K. Itoh, F. Penent
"Multi-electron spectroscopy: Auger decays of the argon 2s hole"
PHYSICAL CHEMISTRY CHEMICAL PHYSICS 13 (2011) 18355.