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 - <p style="text-align: justify;">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. &nbsp;Although the various fragments yield very similar spectra, fewer fragment ions are observed with increasing wavelength.</p>