High resolution absorption spectrum

The same authors were able to measure the high-resolution absorption spectrum of NCNO by detecting the two-photon photodissociation product rotationally hot CN radicals as a function of wavelength. This method allowed them to assign the constants for the ground and excited states. 

Figure 5. High-resolution absorption spectrum of [NH lBr in the region of E excitations at 6K (a) Assignment of the components of band B (b). Reproduced from Ref. 5. Copyright American Chemical Society.

Fig. 7. High resolution absorption spectrum of oxygen showing the window at the wavelength corresponding to Lyman a (refs. 24 and a in Table I).

In addition to transitions in the ir manifold discussed above, some attention has been given recently to possible o-ir states in the ultraviolet nonradlative transitions from the B2jj state. Callomon et al. (27) have postulated the transitions from higher vibrational levels of B2y to a E2u(vapor phase benzene in the 5.0 eV region. initio (12,28) calculations have predicted the presence of at least one a state (e2 ) lying between two filled ir-molecular orbitals. Photoionization (29,30) experiments, and other evidence (31) appear to agree with the conclusion that a-o-ir transition may be... 

The low temperature and high-resolution absorption spectrum of permanganate as recorded by Holt and Ballhausen [12] is shown in Fig. 4. The first allowed band (I) starting at 2.27 eV (18,300 cm 1) has a well-resolved vibronic structure. It is followed by a featureless shoulder (II) at 3.47 eV (28,000 cm-1) and another strong band (III) at 3.99 eV (32,000 cm-1) with a clear vibronic fine structure. We finally have a strong featureless band (IV) at 5.45 eV (43,960 cm-1). 

Figure 10.4 High-resolution absorption spectrum of propane near 1.68 /xm measured by temperature-tuning a distributed feedback (DFB) diode laser Ptotai = 1 atm and T =...

Figure 8. Parts of the simulated high-resolution absorption spectrum of CO (full lines) and H and H2 (dotted lines) at the center of the f Opb cloud (from van Dishoeck and Black 1988).

Cossart-Magos C, Launay F, Parkin JE (1992) High resolution absorption spectrum of CO2 between 1750 and 2000 A. 1. Rotational analysis of nine perpendicular-type bands assigned to a new bent-linear electronic transition. Mol Chem Phys 75 835-856... 

Cossart-Magos C, Jungen M, Launay F (1987) High resolution absorption spectrum of CO2 between 10 and 14 eV, Assignment of nf Rydberg series leading to a new value of the first ionization potential. Mol Phys 61 1077-1117... 

Fig. 4.10 High-resolution absorption spectrum of NO2 near the dissociation wavelength threshold (398 nm) for N02 N0- -0( P). Resolution 0.03 nm at 445 nm (Adapted from Orphal et al. 2003)...

Fig. 16.21 The absorption spectrum of PuF (g). Arrows indicate regions reported to show vibrational structure. Bars indicate regions examined by intracavity laser absorption I, 455 70 II, 550-574 III, 697-729 IV, 786-845 V, 918-971 nm. At the top is a densitometer trace of the high-resolution absorption spectrum of PuF in the 781-830 nm region obtained in multipass experiments. Data from ref. 88.

In Figure 19.5, a high-resolution absorption spectrum (rotational spectrum) of water vapor in the atmosphere at a reduced pressure of 60 Pa is shown, together with the measured THz-TDS signal shown in (a). The abscissa range shown in (b) and (c) covers 0-150 cm , although the spectrum actually measured covers a region from about 1.3 to 230 cm The phase-delay spectrum is also shown in (c), but it does not have any particular analytically useful information. The instrument used for this spectral measurement was manufactured... 

In this spectral range it is up to now the semiconductor diode laser which has been mostly used for high-resolution laser spectroscopy. After HINKLEY [8.37] had first demonstrated in 1970 the superiority of laser spectroscopy over conventional techniques by a high-resolution absorption spectrum of SFg around 10 ym obtained with a Pb-Sn-Te laser, spectra of numerous molecules have been measured with different diode lasers. A review of the literature up to 1975 can be found in the article by HINKLEY et al. [8.38], more recent examples in [8.39] and [8.39a]. 

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