doi:10.1016/j.cplett.2004.04.077
Copyright © 2004 Elsevier B.V. All rights reserved.
Sensitive fluorescence spectroscopy of jet cooled 15NO2
References and further reading may be available for this article. To view references and further reading you must
purchase this article.
E. A. Volkersa, A. Vredenborga, H. Linnartz
, 
, a, J. Bulthuisa, S. Stoltea and R. Jostb
a Department of Physical Chemistry, Laser Centre Vrije Universiteit, De Boelelaan 1083, NL-1081 HV, Amsterdam, The Netherlands
b Laboratoire de Spectrométrie Physique, Université Joseph Fourier de Grenoble, B.P. 87, 38402, Saint Martin d'Hères Cedex, France
Received 19 February 2004;
Revised 23 April 2004.
Available online 18 May 2004.
Abstract
A spectroscopic setup designed for high resolution spectroscopy of jet cooled molecules is described. The primary features of the new setup are an exceedingly low gas consumption and a high detection efficiency, which are achieved by optimizing the detection geometry of the time gated fluorescence in combination with a special piezo valve. This makes the setup particularly suitable for studying expensive gases that come in small supply. The performance of the setup is demonstrated on the first A2B2 ← X2A1 rovibronic transitions of 15N16O2 measured in a jet. A rotational analysis is given for a couple of different bands. In addition, an exceptionally strong band with band origin around 14 850 cm−1 is reported that is of interest particularly for atmospheric applications. The 15N16O2 gas consumption is as low as 0.025 mg or 0.5 μmol/cm−1 spectral range.
Fig. 1. A scheme of the experimental setup. Details are listed in the text (M, mirror; BS, beam splitter; PD, photo-detector).
Fig. 2. An overview scan of rotationally resolved vibronic bands in the A2B2 ← X2A1 transition of 15N16O2. The spectra have been recorded with a gated fluorescence setup optimized for low gas consumption and high sensitivity. The three bands marked with X are shown in detail in Fig. 3, Fig. 4 and Fig. 5. The strong transition around 14 850 cm−1 – that has been clipped here for clarity – is about 3.5 times stronger than the band shown in Fig. 3.
Fig. 3. The rotationally resolved A2B2 ← X2A1 vibronic band of 15N16O2 located at 15520.95(10) cm−1. All transitions are parallel. The five strongest lines belongs to the K=0 stack. The weaker and irregular progression (due to the ‘staggering effect') belong to the K=1 stack.
Fig. 4. The rotationally resolved A2B2 ← X2A1 vibronic band of 15N16O2 located at 14739.8(1) cm−1. Only the K=0 stack with resolved fine structure splittings can be observed.
Fig. 5. The rotationally analysed A2B2 ← X2A1 strong vibronic band of 15N16O2 at 14 850 cm−1 that is vibrationally assigned to a (v1,v2,v3)=(1,5,0) polyad excitation in the excited state. Fits of the K=0 and K=1 stacks are shown separately. Deviations between fitted and observed spectrum do not impede the accuracy of the rotational constants and are related to assumptions regarding the fine structure. The corresponding constants are listed in Table 1.
Table 1. Spectroscopic constants of the vibronic bands shown in Fig. 3, Fig. 4 and Fig. 5. All values are given in cm−1
The fit values are tentative, since they are obtained subject to some restrictions mentioned in the text. The estimated error in the fits of the excited state rotational constants is 0.005 cm−1.
Corresponding author. Fax: +31-20-4447643
Abstract
Purchase PDF (305 K)
E-mail Article
Add to my Quick Links
Cited By in Scopus (3)
Purchase PDF (485 K)
