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  1. Article ; Online: High energy state interactions, energetics and multiphoto-fragmentation processes of HI.

    Jiang, Meng-Xu / Kvaran, Ágúst

    Physical chemistry chemical physics : PCCP

    2022  Volume 24, Issue 11, Page(s) 6676–6689

    Abstract: Mass resolved multiphoton ionization data for two-photon resonant excitations (REMPI) in the 69 000-79 000 ... ...

    Abstract Mass resolved multiphoton ionization data for two-photon resonant excitations (REMPI) in the 69 000-79 000 cm
    Language English
    Publishing date 2022-03-16
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d1cp05714f
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Branching ratios in the dissociative photoionization of iodomethane by photoelectron photoion coincidence.

    Bodi, Andras / Hafliðason, Arnar / Kvaran, Ágúst

    Physical chemistry chemical physics : PCCP

    2023  Volume 25, Issue 10, Page(s) 7383–7393

    Abstract: Iodomethane yields ten fragment ions after valence photoionization, in part by multiple dissociation pathways for each, thanks to a plethora of electronic states available in the parent ion as well as in the fragments. The comprehensive breakdown diagram ...

    Abstract Iodomethane yields ten fragment ions after valence photoionization, in part by multiple dissociation pathways for each, thanks to a plethora of electronic states available in the parent ion as well as in the fragments. The comprehensive breakdown diagram from 11 eV to the double ionization onset,
    Language English
    Publishing date 2023-03-08
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d2cp03339a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Coincidence ion pair production (cipp) spectroscopy of diiodine.

    Matthíasson, Kristján / Kvaran, Ágúst / Garcia, Gustavo A / Weidner, Peter / Sztáray, Bálint

    Physical chemistry chemical physics : PCCP

    2022  Volume 24, Issue 29, Page(s) 17569–17576

    Abstract: Coincidence ion pair production ( ... ...

    Abstract Coincidence ion pair production (I
    Language English
    Publishing date 2022-07-27
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d2cp01684b
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: High energy Rydberg and ion-pair states, state mixing and excitation dynamics of HI.

    Hafliðason, Arnar / Jiang, Meng-Xu / Kvaran, Ágúst

    Physical chemistry chemical physics : PCCP

    2019  Volume 21, Issue 41, Page(s) 23154–23161

    Abstract: Mass resolved multiphoton ionization data for two-photon resonant excitations (REMPI) in the region of 74 000-75 000 cm-1 were recorded for HI. Spectra structures of fragment and molecular ions derived from the data were analyzed to derive information ... ...

    Abstract Mass resolved multiphoton ionization data for two-photon resonant excitations (REMPI) in the region of 74 000-75 000 cm-1 were recorded for HI. Spectra structures of fragment and molecular ions derived from the data were analyzed to derive information relevant to the energetics and state mixing of ion-pair and Rydberg resonance states as well as for the excitation dynamics. Four new ion-pair vibrational states (V1Σ+(v' = m + i); i = 16-19) and two Rydberg states (j3Σ-(0+; v' = 1) and N1Π1(v' = 2)) were identified and characterized. Spectral perturbations allowed characterization and quantization of both homogeneous and heterogeneous state interactions and mixing of the Rydberg states and ion-pair states. Intensity alterations, with respect to energy level excitations and ion masses, are found to be clear indications of state mixing as well as branching into different fragmentation (both photodissociation and photoionization) channels.
    Language English
    Publishing date 2019-10-14
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/c9cp04872c
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Resolving the F

    Matthíasson, Kristján / Kvaran, Ágúst / Garcia, Gustavo A / Weidner, Peter / Sztáray, Bálint

    Physical chemistry chemical physics : PCCP

    2021  Volume 23, Issue 14, Page(s) 8292–8299

    Abstract: Coincidence ion pair production (cipp) spectra of ... ...

    Abstract Coincidence ion pair production (cipp) spectra of F
    Language English
    Publishing date 2021-03-25
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d1cp00140j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Revealing photofragmentation dynamics through interactions between Rydberg states: REMPI of HI as a case study.

    Hróðmarsson, Helgi Rafn / Kvaran, Ágúst

    Physical chemistry chemical physics : PCCP

    2015  Volume 17, Issue 48, Page(s) 32517–32527

    Abstract: High energy regions of molecular electronic states are largely characterized by the nature and involvement of Rydberg states. Whereas there are a number of observed dynamical processes that are due to interactions between Rydberg and valence states, ... ...

    Abstract High energy regions of molecular electronic states are largely characterized by the nature and involvement of Rydberg states. Whereas there are a number of observed dynamical processes that are due to interactions between Rydberg and valence states, reports on the corresponding effect of Rydberg-Rydberg state interaction in the literature are scarce. Here we report a detailed characterization of the effects of interactions between two Rydberg states on photofragmentation processes, for a hydrogen halide molecule. Perturbation effects, showing as rotational line shifts, intensity alterations and line-broadenings in REMPI spectra of HI, for two-photon resonance excitations to the j(3)Σ(-)(0(+); v' = 0) and k(3)Π1(v' = 2) Rydberg states, are analyzed. The data reveal pathways of further photofragmentation processes involving photodissociation, autoionization and photoionization affected by the Rydberg-Rydberg state interactions as well as the involvement of other states, close in energy. Detailed mechanisms of the involved processes are proposed.
    Language English
    Publishing date 2015-12-28
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/c5cp06185g
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Formation of highly excited iodine atoms from multiphoton excitation of CH

    Matthíasson, Kristján / Koumarianou, Greta / Jiang, Meng-Xu / Glodic, Pavle / Samartzis, Peter C / Kvaran, Ágúst

    Physical chemistry chemical physics : PCCP

    2020  Volume 22, Issue 9, Page(s) 4984–4992

    Abstract: Mass resolved REMPI spectra, as well as ... ...

    Abstract Mass resolved REMPI spectra, as well as CH
    Language English
    Publishing date 2020-02-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/c9cp06242d
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Long term puzzles of the CH and CD energetics and related phenomena revisited; solutions sought through REMPI-photofragmentations of bromomethanes.

    Hafliðason, Arnar / Wang, Huasheng / Kvaran, Ágúst

    Physical chemistry chemical physics : PCCP

    2016  Volume 18, Issue 3, Page(s) 1797–1806

    Abstract: Ever since the pioneering work by Herzberg and Johns in 1969 (The Astrophysical Journal, 1969, 158, 399) the spectral assignment and the energetics of the fundamental molecular fragment CH, in the region of 63 000-65 000 cm(-1) (7.81-8.06 eV), have ... ...

    Abstract Ever since the pioneering work by Herzberg and Johns in 1969 (The Astrophysical Journal, 1969, 158, 399) the spectral assignment and the energetics of the fundamental molecular fragment CH, in the region of 63 000-65 000 cm(-1) (7.81-8.06 eV), have remained a puzzle to a large extent. The dissociation of bromoform and deuterated bromoform following two-photon resonance excitations to molecular Rydberg states forms the fragment species CH* and CD* in the excited state A(2)Δ(v' =0) as well as carbon and bromine atoms in the ground and first excited states, C/C* and Br/Br*. Further (1r + 1i)REMPI of CH* and CD* resonance excites the fragments to the energy region of concern, whereas the atom fragments were identified by further (2r + 1i)REMPI. Analysis based on spectral simulations, isotope shifts and comparison with other data allowed spectral identifications, assignments and partial characterization of four highly excited bound states for each of the molecular fragments (CH**/CD**); including the (3)(2)Π valence state and the (4)(2)Π Rydberg state, for the first time. Perturbations, shown as line-shifts, line-intensity and/or line-width alterations, due to the level-to-level state interactions between the bound states and predissociations by a repulsive state are recognized. Recording of C(+) signals in REMPI of several bromomethanes for a one-photon energy of about 40 333 cm(-1) allows the clarification of a mystery concerning a broad C(+) band frequently observed. This work, presented, demonstrates the usefulness of molecular REMPI for fragment analysis.
    Language English
    Publishing date 2016-01-21
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/c5cp06097d
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: State interactions and illumination of hidden states through perturbations and observations of new states: High energy resonance enhanced multiphoton ionization of HI.

    Hróðmarsson, Helgi Rafn / Wang, Huasheng / Kvaran, Ágúst

    The Journal of chemical physics

    2015  Volume 142, Issue 24, Page(s) 244312

    Abstract: Hydrogen iodide, a Hund's case (c) molecule, serves as a benchmark compound for studying rich molecular state interactions between Rydberg and valence states as well as between Rydberg states at high energies (72,300-74,600 cm(-1)) by mass resolved ... ...

    Abstract Hydrogen iodide, a Hund's case (c) molecule, serves as a benchmark compound for studying rich molecular state interactions between Rydberg and valence states as well as between Rydberg states at high energies (72,300-74,600 cm(-1)) by mass resolved resonance enhanced multiphoton ionization (REMPI). Perturbations in the spectra appearing as deformations in line-positions, line-intensities, and linewidths are found to be either due to near-degenerate or non-degenerate interactions, both homogeneous and heterogeneous in nature. Perturbation analyses allow indirect observation as well as characterization of "hidden states" to some extent. Furthermore, new observable spectral features are assigned and characterized.
    Language English
    Publishing date 2015-06-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/1.4922892
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Two-color studies of CH

    Hafliðason, Arnar / Glodic, Pavle / Koumarianou, Greta / Samartzis, Peter C / Kvaran, Ágúst

    Physical chemistry chemical physics : PCCP

    2018  Volume 21, Issue 20, Page(s) 10391–10401

    Abstract: Two-color pump-probe experiments were performed to explore the multiphoton dynamics of CH3Br at high excitation energies of 8-10 eV, involving two-photon resonant excitations to a number of np and nd Rydberg states (pump) followed by REMPI detection ( ... ...

    Abstract Two-color pump-probe experiments were performed to explore the multiphoton dynamics of CH3Br at high excitation energies of 8-10 eV, involving two-photon resonant excitations to a number of np and nd Rydberg states (pump) followed by REMPI detection (probe) of the Br, Br* and CH3(X) photoproducts. Slice images of Br+ and CH3+ ions were recorded in pump-only, probe-only and pump and probe experiments. Kinetic-energy release spectra (KERs), as well as spatial anisotropy parameters, were extracted from the images to identify the processes and the dynamics involved. Predissociation channels, following the two-photon resonant excitations and non-resonant photodissociation forming CH3(X) and Br/Br*, were identified and characterized. Furthermore, the probe excitations for CH3(X) involved near-resonant excitations to lower energy 5s Rydberg states of CH3Br. In three-photon excitation processes, a striking contrast is seen between excitations via the p/d and the s Rydberg states. Involvement of high-energy interactions between Rydberg and ion-pair states is identified.
    Language English
    Publishing date 2018-11-22
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/c8cp06376a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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