CH3CO+ + CH3 being the most favored. The acetone and acetyl ions are observed in the entire wavelength range investigated. Finally, the three-photon resonance multiphoton spectrum of the acetone 3p
n Rydberg transition is also reported.]]>
n Rydberg para la acetona.]]>
High resolution (3+1) REMPI and dissociation of acetone via 3p
n Rydberg transitions
E. Mejía–Ospinoa, I. Álvarezb, and C. Cisnerosb
a Centro de Ciencias Físicas, Universidad Nacional Autónoma de México, Apartado Postal 48–3, 62210 Cuernavaca, Mor. Mexico.
Laboratorio de Espectroscopía Atómica y Molecular, Universidad Industrial de Santander, Bucaramanga, A.A. 678, Colombia.
Corresponding author: Escuela de Química, Universidad Industrial de Santander, UIS, Cra. 27 Clle. 9, A. A. 678, Bucaramanga, Santander, Colombia. Tel: +57 76349069; Fax: +57 76349069; e–mail: emejia@ciencias.uis.edu.co
b Centro de Ciencias Físicas, Universidad Nacional Autónoma de México, Apartado Postal 48–3, 62210 Cuernavaca, Mor. Mexico.
]]>Recibido el 22 de junio de 2006
Aceptado el 8 de agosto de 2006
Abstract
Measurements of multiphoton ionization and dissociation of acetone are reported in the wavelength range 490.0–510.0 nm at 1 nm intervals. To our knowledge there are no available results of (3+1) REMPI on acetone in this region. The experiments were performed using an Nd: YAG–OPO (optical parametric oscillator) laser system coupled to a time–of–flight mass spectrometer. The experimental results show two dissociation channels of the acetone ion, leading to the products (CH3CO+) and (CH3+), the channel CH3COCH3+
CH3CO+ + CH3 being the most favored. The acetone and acetyl ions are observed in the entire wavelength range investigated. Finally, the three–photon resonance multiphoton spectrum of the acetone 3pn Rydberg transition is also reported.
Keywords: REMPI; acetone; Rydberg states; Rydberg transition.
Resumen
En este trabajo se reportan medidas de ionización y disociación multifotónica de acetona en la región comprendida entre 490.0 y 510 nm a intervalos de 1 nm. Por primera vez se observa el proceso (3+1) REMPI en esta región del espectro para la molécula de acetona. Los experimentos fueron llevados a cabo usando un sistema láser Nd: YAG–OPO acoplado a un espectrómetro de masas de tiempo de vuelo. Los resultados experimentales muestran que el ión acetona se disocia a través de los canales CH3CO+ + CH3 y CH3+ + CH3CO, siendo mas favorable el primero de estos canales. Finalmente, presentamos el espectro multifotonico de la transición 3pn Rydberg para la acetona.
PACS: 33.80.Rv; 33.15.Ta; 33.80.Gj
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Acknowledgements
This work was carried out with financial support from CONACYT and DGAPA–UNAM. The authors wish to thank A. Guerrero and A. Bustos for their technical support.
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