High‐resolution, ultraviolet SO 2 photoabsorption cross section data are required for modeling density and temperature profiles of in solar system atmospheres. We report measurements such sections on at 295 K the 1 B ‐ A bands over wavelength range 220 to 325 nm. Resolving powers up 550,000 were employed order study congested spectrum sharp features parts this region. Our compared earlier values obtained with lower resolving power.

Line oscillator strengths in 16 electric dipole-allowed bands of N214 the 93.5–99.5nm(106950−100500cm−1) region have been measured at an instrumental resolution 6.5×10−4nm(0.7cm−1). The transitions terminate on vibrational levels 3pσΣu+1, 3pπΠu1, and 3sσΠu1 Rydberg states b′Σu+1 bΠu1 valence states. J dependences band f values derived from experimental line are reported as polynomials J′(J′+1) extrapolated to J′=0 order facilitate comparisons with results coupled-Schrödinger-equation...

Models of astronomical environments containing CO require accurate molecular data to reproduce and interpret observations. We are conducting experiments at the SOLEIL synchrotron facility acquire for modeling photochemistry in vacuum ultraviolet. The improvement UV spectroscopic instrumentation, both sensitivity resolution, provides more laboratory determinations. report new measurements yielding photoabsorption oscillator strengths predissociation rates, 12C16O 295 K 77 K, four bands from X...

view Abstract Citations (57) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High-Resolution Absorption Cross Sections of Carbon Monoxide Bands at 295 K between 91.7 and 100.4 Nanometers Stark, G. ; Yoshino, K. Smith, Peter L. Ito, Parkinson, W. H. Theoretical descriptions the abundance excitation carbon monoxide in interstellar clouds require accurate data on vacuum-ultraviolet absorption spectrum molecule. The 6.65 m spectrometer Photon...

Acetylene, C 2 H , plays an important role in the photochemistry of atmospheres giant planets, part because its strong absorption features 145–200 nm region where there is significant solar flux. Accurate photoabsorption cross section data at temperatures planetary are required for interpretation observations and reliable photochemical models. We have measured sections acetylene 195 295 K wavelength range 147–201 nm. (The measurements extend to 137 nm.) The high‐resolution spectrometers...

Line oscillator strengths in the 20 electric dipole-allowed bands of (14)N(2) 89.7-93.5 nm (111480-106950 cm(-1)) region are reported from photoabsorption measurements at an instrumental resolution approximately 6 mA (0.7 full width half maximum. The absorption spectrum comprises transitions to vibrational levels 3p sigma(u) c(4)' (1)Sigma(u)(+), pi(u) c(3) (1)Pi(u), and 3s sigma(g) o(3) (1)Pi(u) Rydberg states b' (1)Sigma(u)(+) b valence states. J dependences band f values derived...

SO2 plays an important role in the atmospheric chemistry of Earth, Venus, and Io. This paper presents photoabsorption cross sections from 213 to 325 nm at 198 K, encompassing (C) over tilde B-1(2) - (X) (1)A(1) (B) B-1(1) electronic bands. These measurements are part a series 160 300 K temperature range between 190 nm. The have been measured high resolution (lambda/Delta lambda approximate 450,000) using Fourier transform spectrometry compared other high-resolution literature.

We report oscillator strengths for six strong vibrational bands between 105.0 and 115.2 nm, associated with transitions from the v = 0 level of X1Σ+ ground state to 1 levels B1Σ+, C1Σ+, E1Π states, in 12C16O, 12C17O, 12C18O, 13C16O, 13C18O. These measurements extend development a comprehensive database line positions, strengths, linewidths photodissociating all astrophysically relevant CO isotopologues. The E–X bands, particular, play central roles photodissociation fractionation models...

Fourier-transform spectra of the Δυ = 0 emission bands OH and OD A2Σ+–X2Π systems, produced in a hollow-cathode discharge, were recorded spectral region 29000–34000 cm−1 with resolution 0.05 cm−1. Line lists are presented for 0–0, 1–1, 2–2 both molecules; absolute line position accuracies strongest lines approximately 0.001 The new measured positions used derivation effective molecular parameters rotational term values individual vibrational levels A2Σ+ X2Π states.

A coupled-channel Schrodinger equation (CSE) model of N2 photodissociation, which includes the effects all interactions between b, c, and o 1Pi u C C' 3Pi states, is employed to study rotation on lowest-upsilon u-X 1Sigmag+(upsilon,0) band oscillator strengths predissociation linewidths. Significant rotational dependences are found in excellent agreement with recent experimental results, where comparisons possible. New extreme-ultraviolet (EUV) photoabsorption spectra key b u<--X 1Sigmag...

Photoabsorption cross sections of sulfur dioxide over a range temperatures are required to interpret observations and support models the atmospheres Io Venus. We report high‐resolution ( λ /Δ ≈ 450,000) photoabsorption cross‐section measurements by Fourier transform spectrometry SO 2 at 160 K in wavelength region 199 220 nm, which encompasses strongest features prominent 1 B − A system. Our results compared with literature values obtained lower resolutions 295 recorded earlier same instrument.

SO 2 is an important constituent of the atmospheres Io and Venus. Accurate photoabsorption cross‐section data at temperatures these planetary are required for interpretation observations reliable photochemical models. As part a planned series measurements over 160–300 K range, cross sections 295 K, in wavelength region 198–220 nm, have been determined from very high resolution (resolving power (λ/Δλ) ≈ 450,000) absorption spectra recorded with vacuum ultraviolet Fourier transform...

The nf Rydberg levels of 14N2 converging to the X 2Σ+g ground state N+2 have been studied from n=4–9 in high-resolution absorption spectra supersonically expanding nitrogen at wavelengths ranging 843.2 802.6 Å (118 600–124 600 cm−1). best experimental results, achieving rotational temperatures on order 20 40 K and a resolution 0.5 cm−1, were obtained by photographing jet against background continuum synchrotron radiation source. Complementary data for 15N2 come analyses recorded under...

Models of astronomical environments containing CO require accurate molecular data to reproduce and interpret observations. We conduct experiments at the SOLEIL synchrotron facility acquire model photochemistry in vacuum ultraviolet. The improvement UV spectroscopic instrumentation both sensitivity resolution provides more laboratory determinations. continue our work on photoabsorption oscillator strengths predissociation rates for 12C16O; we report new measurements two additional...

Photoabsorption cross sections for seven electric dipole-allowed N2 bands, at wavelengths between 95.8 and 99.4 nm, have been measured with an instrumental resolution of 6.2×10−4 nm. Integrated band oscillator strengths are presented the c4′ 1Σu+(v′=0)–X 1Σg′(v ″=0) c3 1Πu(v′=0)–X 1Σg+(v″=0) transitions, as well five bands (v′=0,1,2,3,4) in b 1Πu(v′)–X 1Σg+(0) progression. The results compared earlier, lower absorption measurements, electron scattering calculations based on a deperturbation...

High-resolution laser-based one extreme-ultraviolet (EUV)+one UV two-photon ionization spectroscopy and EUV photoabsorption have been employed to study spin-forbidden (3)Pi(u)-X (1)Sigma(g) (+)(v,0) transitions in (14)N(2) (15)N(2). Levels of the C (3)Pi(u) valence 3ssigma(g)F(3) 3ppi(u)G(3) Rydberg states are characterized, either through their direct optical observation, or, indirectly, perturbative effects on (1)Pi(u) (1)Sigma(u) (+) states, which accessible dipole-allowed transitions....

The Hopfield Rydberg series of 14N2 have been reinvestigated both at room temperature under equilibrium conditions and a rotational ∼20 K in supersonically expanding nitrogen. High-resolution absorption spectra the preionizing resonances region from 143 000 to 151 100 cm−1 recorded photographically as well photoelectrically using, respectively, 10.6 m vuv spectrograph National Research Council Ottawa, Canada, 6.65 scanning spectrometer Photon Factory synchrotron facility Tsukuba, Japan....

Oscillator strengths for 48 rotational lines in the 0-0 band of c1Σ ← X1Σ transition 14N2, a prominent feature planetary airglow emissions, have been determined from vacuum ultraviolet photoabsorption spectra recorded with an instrumental resolution ~ 6.5 × 10-4 nm (resolving power ≈150,000). The sum integrated cross sections over all measured lines, including six appearing on account local perturbation by v = 1 b' state, yields room temperature f-value 0.136 ± 0.020. This result is compared...

A new comprehensive multichannel quantum defect study of the near-threshold absorption N214 has been carried out over energy range 118 720–125 425 cm−1. nearly complete understanding rotationally cold spectra reported earlier [K. P. Huber and Ch. Jungen, J. Chem. Phys. 92, 850 (1990); K. et al., ibid. 100, 7957 (1994)] achieved in region where core-excited s d Rydberg levels built on 2Πu state ion interact with series p f complexes converging to lowest vibrational X 2Σg+. The interactions...

view Abstract Citations (27) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Oscillator Strengths of the CN Red System Davis, Sumner P. ; Shortenhaus, Dan Stark, Glenn Engleman, Rolf, Jr. Phillips, John G. Hubbard, Robert Results are reported from laboratory determinations oscillator strengths bands in red system, along wth a rechecking previously obtained violet values. Absorption measurements were made spectra generated by heating carbon...

We carried out experiments at the SOLEIL synchrotron facility to acquire data for modelling CO photochemistry in vacuum ultraviolet. report oscillator strengths and predissociation rates four vibrational bands associated with transitions from v = 0 level of X\hbox{$^{1}\Sigma^{+}$} ground state 0–3 levels core excited W 1 Π Rydberg state, three overlapping 4p π , 5p σ states between 92.9 93.4 nm 13 C 18 O. These results complete those obtained same conditions 12 16 O, O recently published by...

We present high-resolution absorption spectral measurements of the A(1)Π-X(1)Σ(+) band system (13)C(16)O. These were recorded with VUV Fourier transform spectrometer (VUV-FTS) installed on DESIRS beamline at SOLEIL synchrotron. This work includes revised term values that extend to higher J' than previous for most v' levels and lower = 0. confirm previously observed perturbations rotational in greater detail evidence new perturbations. The accuracy wavelength determination is average within...