Volume 2, Issue 2
The Multiphoton Ionization Spectrum of Methyl Iodide Revisited: 1.67-2.2 ev Excitation

Debra Jo Scardino, Matthew D. McDowell, Jacob D. Graham & Nathan I. Hammer

J. At. Mol. Sci., 2 (2011), pp. 93-98.

Published online: 2011-02

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  • Abstract

The study of the multiphoton ionization of methyl iodide has a long and storied history. Here, we revisit this topic and present spectra of each of the photoionization and photodissociation fragments ($C^{+},$ $CH^{+},$ $CH_{2}^{+},$ $CH_{3}^{+},$ $CH_{3}I^{+},$ and $I^{+}$) using a custom time-of-flight mass spectrometer and a tunable dye laser over the excitation range of 550-740 nm (2.2-1.67 eV). The choice of this wavelength range allows for excitation through the $A$ state and resonant ionization through higher energy levels using 4+1, 5+1, or 6+1 photons for excitation and ionization.  Although the various fragments yield very similar spectra, fewer fragment ions are observed with increasing wavelength.

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  • Copyright

COPYRIGHT: © Global Science Press

  • Email address

nhammer@olemiss.edu (Nathan I. Hammer)

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@Article{JAMS-2-93, author = {Scardino , Debra JoMcDowell , Matthew D.Graham , Jacob D. and Hammer , Nathan I.}, title = {The Multiphoton Ionization Spectrum of Methyl Iodide Revisited: 1.67-2.2 ev Excitation}, journal = {Journal of Atomic and Molecular Sciences}, year = {2011}, volume = {2}, number = {2}, pages = {93--98}, abstract = {

The study of the multiphoton ionization of methyl iodide has a long and storied history. Here, we revisit this topic and present spectra of each of the photoionization and photodissociation fragments ($C^{+},$ $CH^{+},$ $CH_{2}^{+},$ $CH_{3}^{+},$ $CH_{3}I^{+},$ and $I^{+}$) using a custom time-of-flight mass spectrometer and a tunable dye laser over the excitation range of 550-740 nm (2.2-1.67 eV). The choice of this wavelength range allows for excitation through the $A$ state and resonant ionization through higher energy levels using 4+1, 5+1, or 6+1 photons for excitation and ionization.  Although the various fragments yield very similar spectra, fewer fragment ions are observed with increasing wavelength.

}, issn = {2079-7346}, doi = {https://doi.org/10.4208/jams.010511.011411a}, url = {http://global-sci.org/intro/article_detail/jams/8114.html} }
TY - JOUR T1 - The Multiphoton Ionization Spectrum of Methyl Iodide Revisited: 1.67-2.2 ev Excitation AU - Scardino , Debra Jo AU - McDowell , Matthew D. AU - Graham , Jacob D. AU - Hammer , Nathan I. JO - Journal of Atomic and Molecular Sciences VL - 2 SP - 93 EP - 98 PY - 2011 DA - 2011/02 SN - 2 DO - http://doi.org/10.4208/jams.010511.011411a UR - https://global-sci.org/intro/article_detail/jams/8114.html KW - methyl iodide, multiphoton ionization, photofragmentation, photoionization, mass spectra. AB -

The study of the multiphoton ionization of methyl iodide has a long and storied history. Here, we revisit this topic and present spectra of each of the photoionization and photodissociation fragments ($C^{+},$ $CH^{+},$ $CH_{2}^{+},$ $CH_{3}^{+},$ $CH_{3}I^{+},$ and $I^{+}$) using a custom time-of-flight mass spectrometer and a tunable dye laser over the excitation range of 550-740 nm (2.2-1.67 eV). The choice of this wavelength range allows for excitation through the $A$ state and resonant ionization through higher energy levels using 4+1, 5+1, or 6+1 photons for excitation and ionization.  Although the various fragments yield very similar spectra, fewer fragment ions are observed with increasing wavelength.

Scardino , Debra JoMcDowell , Matthew D.Graham , Jacob D. and Hammer , Nathan I.. (2011). The Multiphoton Ionization Spectrum of Methyl Iodide Revisited: 1.67-2.2 ev Excitation. Journal of Atomic and Molecular Sciences. 2 (2). 93-98. doi:10.4208/jams.010511.011411a
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