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1.
The PrO XX 0-0 band is recorded at Doppler-limited resolution by laser excitation spectroscopy with selective fluorescence detection. The rotational and hyperfine structure of this band is reanalyzed. In addition, fluorescence spectra obtained through excitation of selected rotational lines in the XX 0-0 band and by the 529-nm Ar + laser line have established an energy ordering of four low-lying states and one state as well as values for the and the two lowest states. Principal constants, in cm ?1, are (1σ uncertainties in parentheses, 1 indicates constant held fixed): | | | | (System XXII) | 18 944 (1) | — | 0.3561 | (System XX) | 17 845.737 (1) | — | 0.355 904 (23) | | 5 720.5 (10) | — | 0.356 (7) | | 3 736.0 (10) | 830.9 (6) | 0.362 (7) | | 3 500.3 (3) | — | 0.3556 (3) | | 1 936.7 (2) | 833.0 (4) | 0.3637 (2) | (System XX and XXII) | 01 | 831.8 (4) | 0.361 918 (22) | 相似文献
2.
The (0,0) bands of nine prominent electronic transitions, Systems X, XI, and XVI through XXII, in the wavelength region 500–800 nm were studied. High-precision (±0.005 cm ?1), Doppler-limited, selectively detected cw-dye laser fluorescence excitation spectra for Systems XVI through XXII were recorded and analyzed. Definitive Ω assignments for the upper and lower states of these transitions were established from identified first lines in the P and R branches. Resolved fluorescence studies revealed 22 additional electronic transitions in the same wavelength region, many of which provide energy linkages between the upper or lower states of previously observed transitions. The comprehensive energy level diagram assembled from 31 electronic transition linkages comprises a total of 22 upper and lower electronic levels. Ω assignments and relative energies for the electronic states of the transitions studied (including Systems XIV and IX identified in fluorescence and the proposed assignment for System VI) are System | Ω′ | | | | VI | 5.5 | 11102 | 4.5 | 2157 | IX | 4.5 | 16597 | 3.5 | 3887 | X | 5.5 | 13259 | 4.5 | 220 | XI | 5.5 | 13865 | 4.5 | 220 | XIV | 5.5 | 16595 | 4.5 | 2157 | XVI | 5.5 | 19169 | 4.5 | 3720 | XVII | 4.5 | 16597 | 3.5 | 0 | XVIII | 7.5 | 21321 | 6.5 | 3965 | XIX | 6.5 | 19687 | 5.5 | 2111 | XX | 5.5 | 18069 | 4.5 | 220 | XXI | 4.5 | 18885 | 4.5 | 220 | XXII | 5.5 | 19169 | 4.5 | 220 | 相似文献
3.
Excitation spectra for the CaF A2Π- X2Σ(0, 0), (1, 1), and (1, 0) bands have been observed and assigned. The rotational analysis of the CaF A- X and B- X bands by B. S. Mohanty and K. N. Upadhya [ Ind. J. Pure Appl. Phys.5, 523 (1967)] is shown to be incorrect. Because it is possible to make independent rotational assignments of each line in an excitation spectrum by observing frequency differences and relative intensities in photoluminescence spectra, tunable laser excitation spectroscopy promises less ambiguity than traditional techniques for assignment of dense, badly overlapped spectra.The following spectroscopic constants (in cm ?1) are obtained for the CaF A2Π and X2Σ states. Numbers in parentheses correspond to three standard deviations uncertainty in the last digit. | | | | | 0 | | 16493.1(6) | | | | 16565.6(6) | | 581.1(9) | | 586.8(9) | | 0.3385(11) | | 0.3436(12) | | — | | 0.00312(21) | α | 0.00255(48) | | 0.00283(45) | | 4.44 × 10?7 | | 4.55 × 10?7 | γ(spin-spin) | |γ| < 3 × 10?3 | | — | | — | | 73.4(9) | | — | | ?0.045(4) | 相似文献
4.
The ν3 fundamental band (CO stretch) of HDCO at 1724 cm ?1 has been studied using both conventional infrared absorption and CO laser Stark spectroscopy. In addition to the excited-state ( v3 = 1) rotational constants, improved constants for the ground state of HDCO have been obtained by combining previous microwave data with some infrared combination differences. The following constants were determined: Constant | Ground state | state | Units | | | 1724.267 | cm?1 | | 198 119.75 | 198 210.4 | MHz | | 34 910.646 | 34 676.6 | MHz | | 29 561.488 | 29 331.3 | MHz | | 2.3302 | 2.3486 | D | | 0.195 | 0.190 | D | 相似文献
5.
Using CO 2 and N 2O lasers, we have measured and assigned nineteen ν4 and nine ν6 rotation-vibration resonances of the type Δ M = 0 and M = J. These transitions were combined with the zero-field pure rotational spectra in order to determine the two fundamental vibrational frequencies, the rotational constants of both excited states, the Coriolis coupling constant, and the dipole moments of each of the three states. The ground-state rotational constants and centrifugal distortion constants were taken from a microwave study and the centrifugal distortion constants of the excited states were assumed equal to those of the ground state. The following results were obtained (standard deviations in parentheses): | | | | | | | | | 938.0345 (6) | | 989.2519 (18) | | (cm?1) | | | 139 579 (150) | | 143 323 (150) | | (MHz) | | | 31 873.6 (5) | | 32 379.5 (7) | | (MHz) | | | 26 242.9 (6) | | 25 994.4 (8) | | (MHz) | | | | 136 178 (770) | | (MHz) | μ | | 2.319 (10) | | 2.347 (4) | | (D) | μ(ground state) | | | 2.3464 (8) | | (D) | 相似文献
6.
Optical-optical double-resonance (OODR) spectra of CaF are recorded, with reduced Doppler broadening, using two cw, single-mode dye lasers. Molecular constants for E2Σ + and are obtained from rotational analysis of the 0-0 and 1-0 E2Σ +- A2Π bands and the 0-0 band, supplemented by fragmentary observations on the E′- A 0-1 and 1-1 bands: | | | | Main parameters | | | | | | | | | | | | 34 171.218(2) | 34 477.413(3) | | | | | 640.912(3) | 668.991(24) | | | | | 0.364393(18) | | 0.368423(50) | | | | | 0.002266(18) | | 0.002375(50) | | | | | | 16.483(4) | | 相似文献
7.
Five new bands of the f1Δ- a1Δ TiO system have been observed in emission between 17774.0 cm ?1 and 19801.0 cm ?1. Rotational and vibrational analyses of the 0-1, 1-0, 1-2, 2-1, and 1-1 bands, as well as a reanalysis of the 0-0 band, yielded the following molecular constants (cm ?1): | | | | | v | | (×106) | | (×106) | 0 | 0.502277 (17) | 0.6411 (57) | 0.536168 (20) | 0.5938 (76) | 1 | 0.499198 (32) | 0.630 (15) | 0.533227 (13) | 0.5971 (46) | 2 | | | 0.530335 (26) | 0.636 (13) | | | | | | | | | | | | | | | | 相似文献
8.
The ν4 and the ν9 bands of CF 2CH 2 have been studied using coincidences with the 10.4 μm band of the CO 2 laser and the 10.9 μm band of the N 2O laser. These resonances have been analyzed, together with recent microwave results, to give the following vibration-rotation parameters and dipole moments in the ν4 and ν9 states | CF2CH2 | CF2CH2 | | | 925.7692 (2) | 953.8057 (2) | cm?1 | | 10 971.99 (2) | 11 026.918 (6) | MHz | | 10 414.98 (2) | 10 436.381 (6) | MHz | | 5328.48 (2) | 5346.100 (6) | MHz | μ | 1.382 (1) | 1.382 (1) | D | | 0.014 (2) | 0.004 (1) | D | 相似文献
9.
We have detected large deviations of the MJ = 0, J = 2 ← 1 Stark effect transition in the linear molecule HCN?HF from predictions of second-, and even fourth-, order perturbation theory. In order to account satisfactorily for the observed effect it has been necessary to set up and diagonalize the appropriate energy matrix. Smaller deviations in the case of MJ = 1, J = 2 ← 1 have likewise been treated. The values of the electric dipole moment for HCN?HF calculated from these transitions, which show large and small deviations from second-order theory, and from one ( MJ = 3, J = 4 ← 3) which shows effectively zero deviation, are now consistent and are as follows: | | | μ/D | 2 ← 1 | 0 | | 5.627 | | 1 | | 5.601 | 4 ← 3 | 3 | | 5.608 | | | Mean | 5.612 | 相似文献
10.
The vibration-rotation fundamental of nitric oxide has been reexamined under conditions of moderately high resolution. The new measurements have been combined with earlier measurements on the pure rotation spectrum to give improved vibration-rotation constants. The main results are (in cm ?1) Constant | | | | | ν | | 0 | | 1875.972 ± 0.001 | | | 123.1393 ± 0.0030 | | 122.8935 ± 0.0042 | | | 1.696115 ± 0.000011 | | 1.678544 ± 0.000032 | 相似文献
11.
About two hundred Stark resonances of the ν2 and ν5 vibration-rotation bands of CD 335Cl, using a 9.4 μm CO 2 laser as a source, have been measured. By combining these data with the zero-field microwave spectra the following molecular constants have been determined (with the standard deviations in parentheses): | | | | | | | | | 1 028.67275 (15) | | 1 059.96970 (11) | | (cm?1) | | | 78 765.20 (89) | | 78 030.21 (109) | | (MHz) | | | 10 805.29 (26) | | 10 860.10 (13) | | (MHz) | | | | | ?25 080.77 (99) | | (MHz) | | | | 8 756.0 (43) | | (MHz) | μ | | 1.90741 (33) | | 1.90607 (36) | | (D) | μ(ground state) | | | 1.90597 (33) | | (D) | 相似文献
12.
The ν2 and ν3 fundamentals of FNO have been recorded with a Fourier transform spectrophotometer at an apodized resolution of approximately 0.004 cm ?1. The Fourier infrared data have been analyzed together with previous microwave data to yield improved molecular parameters for the (000) and (010) vibrational states and the first set of constants for the (001) state. The main results (in cm ?1) are | Ground state | | | A | 3.1751882 (17) | 3.1861249 (12) | 3.1958722 (15) | B | 0.39508266 (12) | 0.39407878 (14) | 0.39211484 (14) | C | 0.35051504 (11) | 0.34899779 (16) | 0.34747411 (14) | | 0 | 765.3551 (4) | 519.5980 (4) | 相似文献
13.
Laser excitation spectra have been recorded for Ca 79Br and Ca 81Br in the spectral region 600–630 nm. The use of a 1-m monochromator as a narrow band pass filter (1–2 cm ?1) has allowed rotational analysis of the 0-0, 1-1, and 2-2 bands of the B2Σ + - X2Σ + transition and the 0-0 and 1-1 bands of the A2Π - X2Σ + transition. A few additional lines of the 0-1, 1-2, 1-0, and 2-1 bands of the B- X system were used to obtain band origins for vibrational analysis. The main constants for Ca 79Br are (in cm ?1): | | | | | 0 | 15 958.41 (10) | 16 383.137 (6) | | 285.732 (9) | 288.56 (20) | 285.747 (9) | | 0.840 (4) | — | 0.954 (4) | | 0.094466141 (30) | 0.0957343 (20) | 0.0965151 (20) | | 0.000403551 (40) | 0.0004327 (20) | 0.0004483 (15) | (spin-rot.) | 0.00301484 (50) | — | 0.068767 (79) | | — | ?0.066834 (64) | — | | — | 59.175 (1) | — | 相似文献
14.
Doppler-limited laser excitation spectroscopy employing narrow-band fluorescence detection was used to obtain a rotational and vibrational analysis in the (0, 0) and (1, 1) bands of the A2Π- X2Σ + system and the (4, 2) (3, 1), (0, 0), (0, 1), (1, 2), (2, 3), and (3, 4) bands of the B2Σ +- X2Σ + system of CaI. The A and B states are deperturbed to obtain spectroscopic constants and Franck-Condon factors. Deperturbation was necessary because of the small separation of the A and B states relative to the A ~ B interaction strength and the A2Π spin-orbit splitting. The main deperturbed constants (in cm ?1) are | | | | | 0 | 15 624.67(5) | 15 700.52(12) | | 238.7496(33) | 241.19(7) | 242.63(17) | | 0.62789(64) | 0.53(5) (Pekeris) | 1.17(12) (Pekeris) | | 0.0693254(84) | 0.070460(14) | 0.071572(22) | | 2.640(35) | 2.15(10) | 3.95(2) | | — | 45.8968(52) | — | | 2.8286(2) | 2.8057(3) | 2.7839(4) | 相似文献
15.
The ν2 (CO stretching) vibration-rotation bands of H 2CO and D 2CO near 5.8 μm have been studied using the technique of laser Stark spectroscopy. The following vibrational and rotational constants have been determined: Constant | H2CO | D2CO | Unit | | 1746.011 | 1701.620 | cm?1 | | 281807.8 ± 6. | 141696.6 ± 7. | MHz | | 38608.7 ± 5. | 32068.4 ± 7. | MHz | | 33738.7 ± 3. | 25998.6 ± 10. | MHz | μ″ | 2.328 ± 0.006 | 2.344 ± 0.006 | Debye | μ′ | 2.344 ± 0.006 | 2.364 ± 0.005 | Debye | 相似文献
16.
Laser excitation spectra of the A2Σ- X2Π i system have been recorded for 63CuS and 65CuS isotopic molecules with a single-mode dye laser operating in the region 17000–18000 cm ?1. For highly overlapped sequences, use of a monochromator as a narrow band filter was necessary to allow rotational analysis. A simultaneous fit of all eight analyzed bands has led to the following spectroscopic constants for 63CuS (in cm ?1): State | | | | | | | | | 0 | 17924.335 (7) | 0.17989 (4) | 0.177 (7) | 0.03853 (7) | | | | 1 | 842.574 (7) | 0.18701 (4) | 0.163 (7) | | 0.01496 (9) | | | 0 | 432.566 (6) | 0.18818 (4) | 0.162 (7) | | 0.01508 (9) | | | 1 | 411.289 (7) | 0.18724 (4) | 0.184 (7) | | | ?0.96 (6) | | 0 | — | 0.18839 (4) | 0.160 (7) | | | ?0.11 (6) | 相似文献
17.
Sub-Doppler optical-optical double-resonance excitation spectra of BaF were recorded using two single-mode cw dye lasers. In the 30 000-cm ?1 region, the electronic states observed were E2Σ + and F2Π. The latter had been previously assigned as the “ F2Σ +” state by Fowler [ Phys. Rev.59, 645–652 (1941)]. The (3, 0) and (4, 0) bands of the E2Σ +- B2Σ + transition and the (1, 0) and (2, 0) bands of the F2Π- B2Σ + transition were rotationally analyzed. The molecular constants suggest inferences about the dominant atomic orbital character of the Rydberg molecular orbitals responsible for the E2Σ + and F2Π electronic states. A new electronic state, the , is predicted. The molecular parameters obtained (in cm ?1, 1σ uncertainty in parentheses) are | | | | | | 3 | 29 767.32(1) | 1 | 29 997.29(1) | | 3 | 522.841(27) | 1 | 522.553(2) | | | 0.22990(22) | | 0.22931(8) | | | 0.00113(14) | | 0.00108(2) | | | | 1 | 56.9840(12) | | | | 1 | ?0.02426(6) | | 3 | ?0.17367(46) | | | 相似文献
18.
The infrared absorption of HNCO has been measured in the region of the NH stretching fundamental and in that of the second overtone. The results for the excited states are (in cm ?1): Band | | | B | C | | 3533.1 | 27.0 | — | — | | 10145.79 | 22.6713 | 0.368426 | 0.361722 | 相似文献
19.
The high dispersion absorption spectrum of the Ag 2 molecule has been photographed in the ~5300–1500-Å region. Observations include the previously reported A ← X, B ← X, C ← X, D ← X, and E ← X transitions and a new H ← X transition which occurs in the vacuum ultraviolet. Extensive spectral blending precluded detailed rotational analyses, but the band structures are consistent with and for D- X and C- X, respectively. The H state is perturbed and probably predissociated. The following molecular constants (in cm ?1) were obtained from fitting bandhead data to the usual expressions: State | Te | ωc | Xωt | X | 0.0 | 192.0 | 0.58 | B | 35 838.6 | 151.8 | 0.87 | C | 37 631.6 | 171.0 | 0.84 | D | 39 014.5 | 168.2 | 1.20 | E | 40 159.9 | 146.1 | 1.58 | H | 58 273.1 | 165.9 | 2.46 | 相似文献
20.
Rotational analysis of 13 emission bands of PrO belonging to 10 different systems was carried out. The derived constants are as follows: | | | | | 18 665.19(1) | 0.3530(1) | 1.80(5) | 0.3622(1) | 2.85(1) | 18 613.22(1) | 0.3517(1) | 0.4(3) | 0.3606(1) | 2.4(2) | 17 842.32(1) | 0.3560(1) | 3.0(1) | 0.3621(1) | 2.7(1) | 17 796.09(4) | 0.3532(3) | 2.4(8) | 0.3604(2) | 2.7(6) | 18 628.22(3) | 0.3530(6) | 1.8(8) | 0.3620(5) | 2.7(7) | 14 426.12(2) | 0.3519(1) | 5.5(6) | 0.3620(1) | 1.9(6) | 13 541.44(2) | 0.3500(2) | 3.7(5) | 0.3605(2) | 2.3(5) | 13 645.78(8) | 0.3511(3) | 3.1(5) | 0.3620(2) | 2.8(5) | 12 961.98(4) | 0.3445(4) | 4.5(4) | 0.3603(3) | 2.3(7) | 9 600.47(1) | 0.3454(1) | 2.8(2) | 0.3620(1) | 3.0(3) | 16 591.29(1) | 0.3536(1) | 0.5(2) | 0.3610(1) | 2.6(1) | 11 912.89(1) | 0.3480(2) | 8.5(8) | 0.3610(1) | 2.2(6) | 10 429.62(2) | 0.3450(1) | 3.1(1) | 0.3610(1) | 3.0(3) | 相似文献
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