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  • Canadian Science Publishing  (19)
  • 1
    Online Resource
    Online Resource
    The A 2 Π i – X 2 Π i band system of ClO: Reinvestigation of the absorption spectrum
    Canadian Science Publishing ; 1976
    In:  Canadian Journal of Physics Vol. 54, No. 10 ( 1976-05-15), p. 1034-1042
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 54, No. 10 ( 1976-05-15), p. 1034-1042
    Abstract: The A 2 Π i –X 2 Π i band system of 35 ClO has been reinvestigated in absorption in the flash photolysis of ClO 2 and Cl 2 /O 2 mixtures, using higher resolving power than in earlier work. The rotational assignments for the ν′–0 progression have been revised and extended and new molecular constants have been obtained. In addition, four new bands with ν″ = 1 and 2 have been observed for the first time. The value for the ground state vibrational interval is found to be [Formula: see text]. Widths are given for levels with 2 ≤ ν′ ≤ 25 and show that all these levels are predissociated. With the help of the theory of long-range interactions, an improved value for the ground state dissociation energy is obtained, viz. D 0 ″ = 22 184 ± 3 cm −1  (≡ 63.427 ± 0.008 kcal/mole ≡ 2.7504 ± 0.0004 eV).
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p76-122
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1976
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  • 2
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    High-resolution laser-excitation spectrum of the A 2 Π ←  X 2 Σ system of TiN: rotational analysis of the 0–0, 1–1, and 2–2 bands
    Canadian Science Publishing ; 1985
    In:  Canadian Journal of Physics Vol. 63, No. 7 ( 1985-07-01), p. 997-1004
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 63, No. 7 ( 1985-07-01), p. 997-1004
    Abstract: The 0–0, 1–1, and 2–2 bands of the A 2 Π ← X 2 Σ system of TiN have been recorded using the technique of laser-excitation spectroscopy. Molecular constants have been obtained from direct least squares fits of the measured line positions of individual bands. The fitted constants confirm and extend previous determinations; for the A 2 Π state, some of the constants show unusually large variations with ν, in accord with the already known perturbation of this state in the ν = 0 level.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p85-163
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1985
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  • 3
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    A Doublet–Quartet Perturbation in CN
    Canadian Science Publishing ; 1975
    In:  Canadian Journal of Physics Vol. 53, No. 16 ( 1975-08-15), p. 1587-1591
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 53, No. 16 ( 1975-08-15), p. 1587-1591
    Abstract: The perturbation of the N = 20, ν = 11 levels of the B 2 Σ + state of CN has been examined in high resolution spectra of the 11–11 and 11–10 violet bands. There is strong evidence that the perturbation is produced by a previously unobserved 4 Σ state.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p75-201
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1975
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  • 4
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    Absolute absorption cross sections at high resolution in the A 2 Π i – X 2 Π i band system of ClO
    Canadian Science Publishing ; 1984
    In:  Canadian Journal of Physics Vol. 62, No. 5 ( 1984-05-01), p. 473-486
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 62, No. 5 ( 1984-05-01), p. 473-486
    Abstract: Chlorine monoxide (ClO) has been produced at temperatures near 315 K in a fast-flow system at total pressures (of argon diluent) in the range 1.0–2.0 mm Hg. The transmittance of ultraviolet radiation has been determined with a spectral resolution of 0.0054 nm for all 35 ClO ν′–0 A 2 Π 3/2 – X 2 Π 3/2 sub-bands in the range 3 ≤ ν′ ≤ 12 (305.9–274.9 nm). The ClO column density obtained with 8 or 12 traversals of the radiation along an 80 cm cell was in the range 1.0–2.0 × 10 17  cm −2 .The experimental transmittance profiles for each sub-band have been reproduced closely by synthetic spectrum calculations. The parameters required as input to the programs were optimized by nonlinear least-squares techniques. The fitted (Lorentzian) linewidths are on average more than double those previously reported from visual estimates of linewidths on photographic plates. The fitted band strengths lead to a well-defined electronic transition moment variation for the A – X system of ClO, which is in excellent agreement with an earlier determination by Mandelman and Nicholls from spectra at lower resolution (0.22 nm) with unresolved rotational structure.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p84-066
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1984
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  • 5
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    The microwave spectrum of the OH X 2 Π radical in the ground and vibrationally-excited (ν ≤ 6) levels
    Canadian Science Publishing ; 1979
    In:  Canadian Journal of Physics Vol. 57, No. 5 ( 1979-05-01), p. 619-634
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 57, No. 5 ( 1979-05-01), p. 619-634
    Abstract: The microwave absorption spectrum of the OH X 2 Π radical has been observed in all vibrational levels up to ν = 6. Experimental details are described of the tunable cavity and parallel plate Stark-modulated spectrometers employed for transitions below and above 23 GHz, respectively. The observed line frequencies, together with those reported by other workers, have been fitted using a non-linear least-squares routine with numerical diagonalization of the Hamiltonian matrix. Pseudo high-order corrections for centrifugal distortion of the Λ-doubling are required for the ν = 0 data, which now extend to J = 19/2 in the 2 Π 1/2 component. The various adjustable parameters of the Hamiltonian are compared with those of other similar models. The Λ-doubling and magnetic hyperfine constants for the different vibrational levels are reported, and several line frequencies of potential astrophysical significance are predicted.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p79-089
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1979
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  • 6
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    First Observation of the BeAr + and BeKr + Molecules: The A 2 Π– X 2 Σ + Band Systems in Emission
    Canadian Science Publishing ; 1975
    In:  Canadian Journal of Physics Vol. 53, No. 19 ( 1975-10-01), p. 2016-2022
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 53, No. 19 ( 1975-10-01), p. 2016-2022
    Abstract: Two new emission systems of violet degraded bands near 4000 Å were recorded from microwave discharges through mixtures of beryllium halide vapors with flowing argon and krypton at pressures ~ 200 Torr. The spectra are assigned as the A 2 Π–X 2 Σ + systems of the hitherto unknown BeAr + and BeKr + molecules. Molecular constants are reported, and the large binding energies are discussed in terms of a predominant ion-induced dipole interaction.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p75-252
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1975
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  • 7
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    Online Resource
    Investigations of metal ion – rare gas pairs by optical spectroscopy: High resolution analysis of the A 2 Π r – X 2 Σ + system of BeAr +
    Canadian Science Publishing ; 1976
    In:  Canadian Journal of Physics Vol. 54, No. 15 ( 1976-08-01), p. 1535-1544
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 54, No. 15 ( 1976-08-01), p. 1535-1544
    Abstract: Rotational analyses have been performed for the 1–0, 0–0, 0–1, 0–2, 0–3, and 0–4 bands of the A 2 Π r –X 2 Σ + system of BeAr + near 4000 Å. Molecular constants have been obtained by direct least squares fits of the line frequencies to model Hamiltonians. The Λ-type doubling in the A state is compared with that found for other nine valence-electron systems. RKR curves are calculated for both states, and provide an estimate of D c ″ = 4100 ± 200 cm −1 for the X 2 Σ + state. Franck–Condon factors and r-centroids for the transition are also reported.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p76-182
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1976
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  • 8
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    Born–Oppenheimer breakdown in the ground state of carbon monoxide: A direct reduction of spectroscopic line positions to analytical radial Hamiltonian operators
    Canadian Science Publishing ; 1992
    In:  Canadian Journal of Physics Vol. 70, No. 1 ( 1992-01-01), p. 40-54
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 70, No. 1 ( 1992-01-01), p. 40-54
    Abstract: A collection of 10 866 of the most precise ground-state (X 1 Σ + ) vibration–rotational and pure rotational line positions of four carbon monoxide isptopomers ( 12 C 16 O, 12 C 18 O, 13 C 16 O, and 13 C 18 O) is employed simultaneously in a direct determination of the radial Hamiltonian operator in compact analytical form. The 22-parameter isotopically self-consistent operator takes full account of the Born–Oppenheimer breakdown and its quantum-mechanical eigenvalues represent all the available spectroscopic line positions of CO isotopomers to within the experimental uncertainties. Rayleigh–Schrödinger perturbation theory is employed to calculate quantum-mechanical molecular constants of rotation (B ν – M ν ) for nine common isotopomeric forms of CO. Together with the quantum-mechanical vibrational eigenvalues these are fully consistent with the exact eigenvalues obtained by direct solution of the radial wave equation. The set of constants is expected to provide an accurate prediction of line positions of CO isotopomers that have not yet been experimentally observed.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p92-004
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1992
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  • 9
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    Rotational analysis of the B 1 Σ + → X 1 Σ + system of H 35 Cl
    Canadian Science Publishing ; 1985
    In:  Canadian Journal of Physics Vol. 63, No. 12 ( 1985-12-01), p. 1485-1497
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 63, No. 12 ( 1985-12-01), p. 1485-1497
    Abstract: The B 1 Σ + → X 1 Σ + system of HCl has been recorded photographically at high resolution in the range 155–250 nm. Rotational assignments of the measured line positions have been made for 39 bands of H 35 Cl with 0 ≤ ν′ ≤ 6and7 ≤ ν" ≤ 17. Least squares parameter estimates from individual bands have been merged to obtain a set of single-valued parameters that reproduces most of the experimental data to within the measurement precision. First-order Rydberg–Klein–Rees (RKR) turning points for the B and X states are reported from a second set of parameters derived from a truncated data set. The reliability of the ground-state RKR potential is discussed in terms of the first-order approximation and Born–Oppenheimer breakdown. Transitions have been observed to quasi-bound states of several high-lying vibrational levels of the ground state.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p85-249
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1985
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  • 10
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    Online Resource
    Electronic spectra of metal ion – rare gas pairs: High resolution analysis of the A 2 Π r – X 2 Σ + system of BeKr +
    Canadian Science Publishing ; 1977
    In:  Canadian Journal of Physics Vol. 55, No. 3 ( 1977-02-01), p. 254-260
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 55, No. 3 ( 1977-02-01), p. 254-260
    Abstract: The A 2 Π r –X 2 Σ + system of Be 84 Kr + has been studied at high resolution in the region 3950–4265 Å. Rotational analyses have been performed for the 0–1, 0–0, 1–0, and 2–0 bands, and molecular constants have been determined by least squares fits of the line frequencies to model Hamiltonians. The regular nature of the excited state has been confirmed, despite the opposite signs found for the Λ-doubling constants, p and q. Comparisons of the Λ-doubling constants for the A 2 Π r state and of the spin-splitting constant (γ) for the X 2 Σ + state have been made with those for other nine valence-electron diatomics. Although a systematic study of isotope effects due to the several isotopes of naturally-occurring krypton has not been possible, at least one branch of the 1–0 band of Be 86 Kr + has been identified unequivocally.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p77-037
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1977
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