Cyclic Ketone Mixture Analysis Using 2 + 1 Resonance-Enhanced Multiphoton Ionization Mass Spectrometry

Nesselrodt, Dale R.; Baer, Tomas

doi:10.1021/ac00087a014

Cited by 15 publications

(4 citation statements)

References 32 publications

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“…Our one-color REMPI apparatus has been described previously. 29 Briefly, the output of a Quanta-Ray Nd:YAG pumped 0022-3654/95/2099-4458$09.00/0 © 1995 American Chemical Society dye laser (PDL-2) is frequency mixed with the Nd:YAG fundamental by an angle-tuned KD*P crystal in a Quanta-Ray wavelength extender (WEX-1) to generate light in the 390-405 nm wavelength range. Photons of this wavelength have just half the energy needed to reach the 3s state near 50 000 cm-1.…”

Section: Methodsmentioning

confidence: 99%

Observations of Ethyl-Substituted Cyclohexanone and Cyclopentanone Rotamers Using Resonance-Enhanced Multiphoton Ionization Spectroscopy

Nesselrodt¹,

Potts²,

Baer³

1995

J. Phys. Chem.

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The various rotamer conformations associated with the hindered ethyl group rotor in ethyl-substituted cyclohexanones and cyclopentanones have been trapped in a supersonic expansion and spectroscopically analyzed by 2 + 1 resonance-enhanced multiphoton ionization via the 3s -n Rydberg transition. The rapid cooling in the supersonic expansion effectively freezes many of the conformations at their room temperature equilibrium concentrations. The various rotamers, including some in the axial orientation, were identified by comparing peak intensities with those calculated by both molecular mechanics and ab initio MO methods.Excellent agreement between the calculations and the experimental results is noted.

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Section: Methodsmentioning

confidence: 99%

Observations of Ethyl-Substituted Cyclohexanone and Cyclopentanone Rotamers Using Resonance-Enhanced Multiphoton Ionization Spectroscopy

Nesselrodt¹,

Potts²,

Baer³

1995

J. Phys. Chem.

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“…[1][2][3][4] However, one can also use it directly as an analytical technique by measuring the ionization current with an electrode. In the REMPI process, a molecule is excited by a photon, or photons, whose energy is in resonance with an electronic state of the molecule.…”

Section: Introductionmentioning

confidence: 99%

Resonance-enhanced multiphoton ionization for real-time monitoring of trichloroethylene formed by degradation of tetrachloroethylene using zero-valent zinc

et al. 2004

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Resonance-enhanced multiphoton ionization ͑REMPI͒ is investigated as a potential technique for realtime monitoring of selected volatile organochloride compounds ͑VOCs͒. In a proof-of-concept experiment, the progress of the reductive-degradation of tetrachloroethylene ͑PCE͒ to trichloroethylene ͑TCE͒ by zero-valent zinc was monitored by REMPI measurements performed in the headspace above the PCE solution. Two-photon resonant REMPI spectra of TCE and PCE were recorded over the wavelength range 305-320 nm. The concentrations of PCE and TCE in the headspace were monitored by measurement of the ionization signal with 315.64-and 310.48-nm excitation for PCE and TCE, respectively. Calibration curves yielded a linear range of more than 2 orders of magnitude for both compounds. The REMPI headspace results agreed well with the solution-phase results from gas chromatography analysis, which was used for independent verification of the progress of the reaction.

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“…An alternative technique, resonance-enhanced multiphoton ionization (REMPI), 5 is a demonstrated 6 ultrasensitive technique for measurement of trace volatile organic contaminants. This technique has been widely used for decades as a selective ionization source in mass spectrometry [7][8][9][10][11][12][13] and for spectroscopic combustion analysis. [14][15][16][17] REMPI is also nearly ideal for in situ measurements in the field.…”

Section: Introductionmentioning

confidence: 99%

A Non-Lensed Fiber-Optic Resonance-Enhanced Multiphoton Ionization Probe

et al. 2004

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We have developed a miniature fiber-optic probe with no focusing optics for in situ analysis of volatile organic compounds (VOCs). The probe uses an optical fiber to transmit a laser pulse to a vapor sample causing it to ionize adjacent to the fiber tip through a resonance-enhanced multiphoton ionization (REMPI) process. The distal end of the optical fiber is contained co-axially within 2-mm-inner-diameter stainless steel tubing that serves as an electrode. The electrode is biased at a high positive potential to collect electrons. The current generated is shown to be proportional over about two orders of magnitude to the concentration of the species ionized. Visible wavelength REMPI spectroscopy is used to determine probe sensitivities of 20 ppb (benzene) and 43 ppb (toluene). Designing the probe without focusing optics specifies an achromatic ionization region constant in size and position as the laser wavelength is scanned, which simplifies data collection and reduction. Focusing achromatic systems are discussed and the potential signal improvement is estimated.

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Cyclic Ketone Mixture Analysis Using 2 + 1 Resonance-Enhanced Multiphoton Ionization Mass Spectrometry

Cited by 15 publications

References 32 publications

Observations of Ethyl-Substituted Cyclohexanone and Cyclopentanone Rotamers Using Resonance-Enhanced Multiphoton Ionization Spectroscopy

Observations of Ethyl-Substituted Cyclohexanone and Cyclopentanone Rotamers Using Resonance-Enhanced Multiphoton Ionization Spectroscopy

Resonance-enhanced multiphoton ionization for real-time monitoring of trichloroethylene formed by degradation of tetrachloroethylene using zero-valent zinc

A Non-Lensed Fiber-Optic Resonance-Enhanced Multiphoton Ionization Probe

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