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Journal Articles

Fluorescence decay processes following resonant 2p photoexcitation of Ar atoms and clusters studied using a time-resolved fluorescence and photoion coincidence technique

Gejo, Tatsuo*; Ikegami, Takeshi*; Homma, Kenji*; Harries, J.; Tamenori, Yusuke*

Journal of Physics B; Atomic, Molecular and Optical Physics, 46(7), p.075102_1 - 075102_9, 2013/04

 Times Cited Count:3 Percentile:19.12(Optics)

Journal Articles

A Study to control chemical reactions using Si:2p core ionization; Site-specific fragmentation

Nagaoka, Shinichi*; Fukuzawa, Hironobu*; Pr$"u$mper, G.*; Takemoto, Mai*; Takahashi, Osamu*; Yamaguchi, Takuhiro*; Kakiuchi, Takuhiro*; Tabayashi, Kiyohiko*; Suzuki, Isao*; Harries, J.; et al.

Journal of Physical Chemistry A, 115(32), p.8822 - 8831, 2011/07

 Times Cited Count:28 Percentile:71.26(Chemistry, Physical)

Journal Articles

Selective vibrational excitation in the resonant Auger decay following core-to-$$pi^*$$ transitions in N$$_2$$O

Travnikova, O.*; C$'e$olin, D.*; Bao, Z.*; B${o}$rve, K. J.*; Tanaka, Takahiro*; Hoshino, Masamitsu*; Kato, Hideki*; Tanaka, Hiroshi*; Harries, J.; Tamenori, Yusuke*; et al.

Journal of Electron Spectroscopy and Related Phenomena, 181(2-3), p.129 - 134, 2010/08

 Times Cited Count:1 Percentile:7.38(Spectroscopy)

In N$$_2$$O a detailed study of the vibrational distribution of the state reached after decay of core-to-$$pi^*$$ excitation of N terminal, N central and O 1s core levels is reported. We observe a change in the relative intensity of bending versus stretching modes while scanning the photon energy across all three resonances. While this effect is known to be due to the Renner-Teller splitting in the core-excited states, we could derive that the antisymmetric stretching is excited mainly in the decay of the N terminal 1s-to-$$pi^*$$ excitation. An explanation for such selectivity is provided in terms of interplay of vibrational structure on potential energy surfaces of different electronic states involved in the process.

Journal Articles

Is CO Carbon ${it KVV}$ Auger electron emission affected by the photoelectron ?

Pr$"u$mper, G.*; Fukuzawa, Hironobu*; Rolles, D.*; Sakai, Katsunori*; Prince, K. C.*; Harries, J.; Tamenori, Yusuke*; Berrah, N.*; Ueda, Kiyoshi*

Physical Review Letters, 101(23), p.233202_1 - 233202_4, 2008/12

 Times Cited Count:12 Percentile:59.61(Physics, Multidisciplinary)

Using an electron-ion coincidence experiment, a long-standing question regarding the applicability of the "two-step model" to the Auger decay following C 1s excitation in the CO molecule is addressed. The momenta of O$$^{+}$$ fragments are recorded in coincidence with C(1s) KVV Auger electrons for 3 different photon energies and both vertical and horizontal polarization of the incident radiation. The angular distribution of the Auger electrons is found to be independent of both energy and polarization, and the two-step model deemed to be valid.

Journal Articles

Interatomic Coulombic decay following the Auger decay; Experimental evidence in rare-gas dimers

Ueda, Kiyoshi*; Fukuzawa, Hironobu*; Liu, X.*; Sakai, Katsunori*; Pr$"u$mper, G.*; Morishita, Yuichiro*; Saito, Norio*; Suzuki, Isao*; Nagaya, Kiyonobu*; Iwayama, Hiroshi*; et al.

Journal of Electron Spectroscopy and Related Phenomena, 166-167, p.3 - 10, 2008/11

 Times Cited Count:23 Percentile:72.45(Spectroscopy)

Interatomic Coulombic decay (ICD) in Ar$$_2$$, ArKr and Kr$$_2$$ following Ar 2p or Kr 3d Auger decay has been investigated by means of momentum-resolved electron-ion-ion-coincidence spectroscopy. This sequential decay leads to Coulombic dissociation into dication and monocation. Simultaneously determining the kinetic energy of the ICD electron and the kinetic energy release between the two atomic ions, we could unambiguously identify the ICD channels. We find that, in general, spin conserved ICD, in which the singlet (triplet) dicationic state produced via the atomic Auger decay preferentially decays to the singlet (triplet) state, transferring the energy to the other atom, is faster than the spin-flip ICD, in which the Auger final singlet (triplet) dicationic state decays to the triplet (singlet) state.

Journal Articles

Photoabsorption spectra of CF$$_3$$I and thermally dissociated CF$$_3$$I near the C 1s, I 3d and F 1s ionisation thresholds

Tanaka, Takahiro*; Hoshino, Masamitsu*; Kato, Hideki*; Harries, J.; Tamenori, Yusuke*; Ueda, Kiyoshi*; Tanaka, Hiroshi*

Journal of Electron Spectroscopy and Related Phenomena, 164(1-3), p.24 - 27, 2008/07

 Times Cited Count:4 Percentile:24.57(Spectroscopy)

We report soft X-ray total ion yield and angular-resolved ion yield spectra of CF$$_3$$I in the C 1s, I 3d and F 1s ionisation regions, and tentatively assign the observed electronic states. Anisotropy in ion yield is observed only for the C 1s$$rightarrowsigma^*_{C-I}$$ transition, indicating that the dipole moment for this transition is parallel to the C$$_{3v}$$. The effusive source of CF$$_3$$I is heated to 800 K to produce a mixture of CF$$_3$$ and I, and the resulting spectra are compared to those recorded at room temperature to reveal the first information on the inner-shell excitation of CF$$_3$$.

Oral presentation

The Decay routes of argon clusters studied using time-resolved fluorescence

Gejo, Tatsuo*; Iseda, Mitsuhiro*; Homma, Kenji*; Harries, J.; Tamenori, Yusuke*

no journal, , 

When a cluster undergoes inner-shell excitation, as well as electrons and ions fluorescence photons can also be detected. Depending on the excited state, the lifetime of this fluorescence is different, and so recording the arrival times of the photons relative to the exciting radiation, information can be obtained on the excited state distribution. This technique has previously been applied to the helium atom and water molecule, and is applied to clusters for the first time here. For argon clusters there are broadly two lifetime components, and their origin is discussed.

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