Doppler-Free Two-Photon Spectroscopy Applied to Molecular Electronic Transitions

1977 ◽  
Vol 16 (2) ◽  
Author(s):  
Jerry A. Gelbwachs ◽  
John E. Wessel
Keyword(s):  
Electronic Transitions ◽  
Molecular Electronic ◽  
Two Photon

The spectroscopy of jet-cooled porphyrins: an insight into the vibronic structure of the Q band

2010 ◽  
Vol 14 (04) ◽  
pp. 314-323 ◽  
Author(s):  
Joseph M. Beames ◽  
Timothy D. Vaden ◽  
Andrew J. Hudson
Keyword(s):  
Laser Desorption ◽  
Electronic Transitions ◽  
Quantum Mechanical ◽  
Supersonic Expansion ◽  
Two Photon ◽  
Vibrational Levels ◽  
Inert Carrier ◽  
Mechanical Interpretation ◽  
Photon Ionization ◽  
Insight Into

We will present resonant two-photon ionization spectra for meso-tetraphenylporphyrin, H 2 TPP , measured under isolated conditions. The polycrystalline compound was vaporized, in vacuo, using both thermal and laser desorption, and seeded into a supersonic expansion of an inert-carrier gas. The molecules remain largely intact in the gaseous phase. However, the two techniques for vaporizing H 2 TPP give different internal temperatures for the isolated substrate, with greater vibrational cooling achieved using laser desorption. A comparison of the peak positions and intensities in the resonant two-photon ionization spectra of thermal- and laser-desorbed molecules provides an insight into the vibrational structure of the Q band. In particular, the greater contribution made by electronic transitions originating from higher vibrational levels in the ground state of H 2 TPP is emphasized. We conclude that vibronic coupling in the ground electronic state plays an important role in a quantum-mechanical interpretation of the Q band.

A different view of molecular electronic transitions

1986 ◽  
Vol 90 (4) ◽  
pp. 580-583 ◽  
Author(s):  
Hugh Taylor ◽  
Jack Simons
Keyword(s):  
Electronic Transitions ◽  
Molecular Electronic

Molecular electronic transitions observed by inelastic tunneling spectroscopy

1977 ◽  
Vol 15 (2) ◽  
pp. 750-754 ◽  
Author(s):  
S. de Cheveigné ◽  
J. Klein ◽  
A. Léger ◽  
M. Belin ◽  
D. Défourneau
Keyword(s):  
Tunneling Spectroscopy ◽  
Electronic Transitions ◽  
Molecular Electronic ◽  
Inelastic Tunneling
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