The generation of a tunable laser emission in the vacuum ultraviolet and its application to supersonic jet/multiphoton ionization mass spectrometry

Uchimura, Tomohiro; Onoda, Takayuki; Lin, Cheng Huang; Imasaka, Totaro

doi:10.1063/1.1149901

Cited by 12 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measurements of diazepam and ketamine should be repeated using a supersonic jet inlet. 41,42 The sample is expanded and therefore the spectral broadening of the electronic UV absorption bands is prevented due to thermal excitation. Hence, it is possible to receive more sensitive results and limited fragmentation.…”

Section: Outlook and Conclusionmentioning

confidence: 99%

Investigation of the Photoionization Properties of Pharmaceutically Relevant Substances by Resonance-Enhanced Multiphoton Ionization Spectroscopy and Single-Photon Ionization Spectroscopy Using Synchrotron Radiation

et al. 2013

View full text Add to dashboard Cite

The photoionization properties of the pharmaceutically relevant substances amantadine, diazepam, dimethyltryptamine, etomidate, ketamine, mescaline, methadone, and propofol were determined. At beamline U125/2-10m-NIM of the BESSY II synchrotron facility (Berlin, Germany) vacuum ultraviolet (VUV) photoionization spectra were recorded in the energy range 7.1 to 11.9 eV (174.6 to 104.2 nm), showing the hitherto unknown ionization energies and fragmentation appearance energies of the compounds under investigation. Furthermore, (1+1)-resonance-enhanced multiphoton ionization (REMPI) spectra of selected compounds (amantadine, diazepam, etomidate, ketamine, and propofol) were recorded by a continuous scan in the energy range between 3.6 and 5.7 eV (345 to 218 nm) using a tunable optical parametric oscillator (spectral resolution: 0.1 nm) laser system. The resulting REMPI wavelength spectra of these compounds are discussed and put into context with already known UV absorption data. Time-of-flight mass spectrometry was used for ion detection in both experiments. Finally, the implications of the obtained physical-chemical results for potential analytical applications are discussed. In this context, fast detection approaches for the considered compounds from breath gas using photoionization mass spectrometry and a rapid pre-concentration step (e.g., needle trap device) are of interest.

show abstract

Section: Outlook and Conclusionmentioning

confidence: 99%

Investigation of the Photoionization Properties of Pharmaceutically Relevant Substances by Resonance-Enhanced Multiphoton Ionization Spectroscopy and Single-Photon Ionization Spectroscopy Using Synchrotron Radiation

et al. 2013

View full text Add to dashboard Cite

show abstract

“…acheivable near 232 nm [38][39][40][41][42][43]. Therefore, the precise knowledge of static and dynamic polarizabilities of the low lying states of Y 2+ are very much important for the above experiments and also relevant for measurements such as collinear laser spectroscopy [33] and black-body radiation shift [34,44,45], etc.…”

mentioning

confidence: 99%

Precise many-body calculations and hyperfine interaction effect on dynamic polarizabilities at the low-lying energy levels of Y$^{2+}$

Das,

Bhowmik,

Dutta

et al. 2018

Preprint

View full text Add to dashboard Cite

The present work determines the precise values of magic wavelengths corresponding to the clock transitions 5 2 S-4 2 D of Y 2+ ion both at the levels of fine-and hyperfine-structures due to the external light beams having linear as well as circular polarization. To calculate the dynamic polarizabilities of the associated states of the transitions, we employ the sum-over-states technique, where dominating and correlation sensitive part of the sum is evaluated using a highly correlated relativistic coupled-cluster theory. The estimated magic wavelengths of the light beams have substantial importance to cool and trap the ion using a state-insensitive and blue-detuned trapping scheme. We also present the tune-out wavelengths which are useful in state-insensitive trapping and cooling. Noticeable contributions to the total polarizabilities were observed from the vector part due to the circularly polarized light beams which provide additional magic wavelengths compared to linearly polarized light beams. Considerable effects of hyperfine interaction on the values of polarizabilities and number of magic wavelengths divulge the importance of precise estimations of hyperfine structure splitting.

show abstract

“…In this technique, a single-color (fundamental) laser beam is focused into molecular hydrogen to generate a Stokes beam by stimulated Raman scattering (SRS). 11 The two beams (pulses) are spatially and temporally superimposed, and can be readily used as a two-color beam for REMPI using passive equipment, such as a Raman cell. The mass and MPI spectra of p-dichlorobenzene were measured by employing this system in order to demonstrate its potential for use in the on-line real-time monitoring of PCDD/F having a high ionization potential and a low energy for a photon used in the excitation at the 0-0 transition.…”

mentioning

confidence: 99%

“…The principles of operation of SSJ/REMPI/TOF-MS and SRS have been described previously. [11][12][13] The second-harmonic emission of an optical parametric oscillator (Spectra-Physics, MOPO-730, 1 mJ, 6 ns, 0.2 cm -1 ) is focused by a lens into a Raman cell filled with hydrogen. The two-color beam generated by SRS is focused into a jet.…”

mentioning

confidence: 99%

Resonance-enhanced Multiphoton Ionization Mass Spectrometry Using a Two-color Laser Beam Generated by Stimulated Raman Scattering

2003

Self Cite

View full text Add to dashboard Cite

A wide variety of chemical species, such as chlorinated aromatic hydrocarbons, are emitted from an incinerator. Among such compounds, polychlorinated dibenzo-p-dioxin and polychlorinated dibenzofuran (PCDD/F) are known to be extremely toxic, and the on-line real-time monitoring of such compounds would be highly desirable. A lengthy pretreatment process followed by high-resolution gas chromatography/mass spectrometry is the current method of choice for the analysis of PCDD/F. 1,2 However, this type of approach is not suitable for the on-line real-time monitoring of PCDD/F emitted from an incinerator.Resonance-enhanced multiphoton ionization/time-of-flight mass spectrometry (REMPI/TOF-MS) 3,4 constitutes an attractive solution to this problem. Combined with supersonic jet spectrometry (SSJ), 5,6 REMPI/TOF-MS provides superior selectivity than the conventional (room temperature) approach, as the result of sharp spectral features obtained by jet expansion and subsequent molecular cooling. However, there are several problems associated with the measurements of PCDD/F by SSJ/REMPI/TOF-MS. In particular, the ionization potential increases and the 0-0 transition energy decreases with increasing numbers of substituted chlorine atoms, as reported for PCDD. Therefore, the energy of the photon used for excitation at the 0-0 transition becomes insufficient for use in subsequent ionization from the excited state to the ionized levels. For this reason, it is necessary to use a three-photon process, but the efficiency is rather poor. In addition, a highpower laser is needed for three-photon ionization, which leads to non resonant ionization, and makes differentiation of the isomers of PCDD/F difficult. In order to solve this problem, two-color REMPI has been developed. [7][8][9][10] In two-color REMPI, the first photon, with an energy less than the second one, is used for excitation, and the second photon (higher energy than the first) is used for ionization of the molecule, for example, in the case of PCDD/F. A laser source consisting of two sets of laser systems emitting at different wavelengths is currently used for this purpose, although the ionization laser (e.g., the fourth harmonic emission of the Nd:YAG laser) is sometimes constructed utilizing the same Nd:YAG laser as that employed for pumping the tunable laser to simplify the system. 7-10 This approach is complicated because two laser beams (pulses) must be both spatially and temporally adjusted to each other. Moreover, the analytical system becomes more expensive because two lasers are needed. As a result, it is impractical for use in applications to the on-line monitoring of PCDD/F emitted from an incinerator.In this study, SSJ/REMPI/TOF-MS using a two-color laser system was demonstrated. In this technique, a single-color (fundamental) laser beam is focused into molecular hydrogen to generate a Stokes beam by stimulated Raman scattering (SRS). 11 The two beams (pulses) are spatially and temporally superimposed, and can be readily used as a two-color beam for REMPI u...

show abstract

The generation of a tunable laser emission in the vacuum ultraviolet and its application to supersonic jet/multiphoton ionization mass spectrometry

Cited by 12 publications

References 20 publications

Investigation of the Photoionization Properties of Pharmaceutically Relevant Substances by Resonance-Enhanced Multiphoton Ionization Spectroscopy and Single-Photon Ionization Spectroscopy Using Synchrotron Radiation

Investigation of the Photoionization Properties of Pharmaceutically Relevant Substances by Resonance-Enhanced Multiphoton Ionization Spectroscopy and Single-Photon Ionization Spectroscopy Using Synchrotron Radiation

Precise many-body calculations and hyperfine interaction effect on dynamic polarizabilities at the low-lying energy levels of Y$^{2+}$

Resonance-enhanced Multiphoton Ionization Mass Spectrometry Using a Two-color Laser Beam Generated by Stimulated Raman Scattering

Contact Info

Product

Resources

About