Studies of labile molecules with a tunable dye laser

Clyne, Michael A. A.; Curran, A.H.; Coxon, John A.

doi:10.1016/0022-2852(67)90133-6

Cited by 19 publications

(4 citation statements)

References 27 publications

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“…The iodine atom thus produced might then react with 02F to form excited IF. For example HI + 02F -> [IHF]* + 02 -I + HF + 02 (12) I + 02F ->• IF* + 02 (6) The existence of channels analogous to process 12 for the I2-F2 reaction were reported in the molecular beam study, 24 and the authors indicated that these channels open at energies only slightly greater than that required for formation of the complex. Given the substantial exothermicities of reactions 9-11, it seems plausible that such processes participate in the 02F reactions.…”

Section: Resultsmentioning

confidence: 93%

Chemiluminescent reactions of oxygen fluoride. 2. Reactions producing excited bromine fluoride and iodine fluoride

Coombe¹,

Horne²

1979

J. Phys. Chem.

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Publication costs asslsted by Rockwell InternationalChemiluminescence from electronically excited BrF and IF has been observed from reactions of molecular halides (Br2, Iz, ICl, and HI) with OzF. Much more intense emission is produced by reactions of bromine or iodine atoms with OzF in the presence of excited singlet molecular oxygen. The emission spectra and photon yields of these reactions are consistent with a proposed mechanism in which the X + OzF reactions produce vibrationally excited ground state XFt molecules. These may cross to the A W , ) state (if sufficient energy is available) or be pumped to the B(3110+) state by collisions with excited singlet oxygen. In the reactions of molecular halides with OzF, halogen atoms may be produced via formation and decomposition of a triatomic complex.

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Section: Resultsmentioning

confidence: 93%

Chemiluminescent reactions of oxygen fluoride. 2. Reactions producing excited bromine fluoride and iodine fluoride

Coombe¹,

Horne²

1979

J. Phys. Chem.

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“…原子和分子光谱学在许多方面有重要应用，如原子和分子结构研究 [1] 、精密测量 [2,3] 、以及寻找电子电偶极矩(eEDM) [4][5][6] 、验证精细结构常数 [7][8] 可能随时间的变化等相关应用 [9][10] ．原子分子的超精细结构，通常掩盖于 Doppler 背景之中，只有采用冷却方法才能加以观测．传统的制冷手段为超声束膨胀技术，可以将样品冷却至 1 K 量级．然而，该技术所获得的冷却温度不足够低、样品的吸收长度短、样品浓度起伏较大．这些缺点使得其难以满足现代原子分子光谱学及其应用的需求．近几十年来，现代冷原子和冷分子物理 [11][12][13][14][15][16][17][18] 的飞速发展，为原子分子的超精细结构的精确研究提供了坚实的研究平台，使得我们可以同时进行超高分辨率、超高精度和超高灵敏度的光谱研究，赋予了原子和分子光谱学新的生命．超精细光谱可揭示原子分子内的弱核相互作用，与价格不菲的核物理方法相比，通过原子分子光谱学获得核内信息更为经济．相较于分子冷却的深入研究，冷分子光谱的研究还相对较少．另一方面，冷分子光谱学 [11,[13][14][15][16][17][18] 所获得的精确的分子超精细结构，对于冷分子的诸如碰撞、操控、进一步冷却乃至最终实现分子玻色-爱因斯坦凝聚(BEC)等也至关重要．这就是说，分子超精细结构的研究，也将促进冷分子物理及其应用研究的发展．碱金属双原子冷分子在实验和理论上都取得了许多研究成果 [19][20][21][22][23] ．然而，它们的化学性质不稳定，尽管采用外加电场可以在一定程度上抑制这种化学反应 [24] ，但这仍影响碱金属冷分子的各种应用．卤素异核极性分子化学性质稳定，在冷分子领域必然会有更广泛的应用，而且采用近共振红失谐激光辅助 Stark 减速 [25][26][27] 将等效温度降至 1 mK 量级．在卤素双原子分子中， BrF 的研究最少．最早由 Smith 等人 [28] 于 1950 年报道了微波区 J = 1←0 的超精细光谱，后来 Calder 等人 [29] 提高了分子常数的精度．Nair 等人 [30] 进一步研究了 BrF 的振动基态内 J = 1←0 和 J = 2←1 跃迁的超精细光谱，并获得了分子电偶极矩和核电四极矩．此外，Clyne 等人 [31] 使用激光感应荧光光谱技术观测并分析了 BrF 的 B 3 Π 0…”

Section: 引言unclassified

Simulation of hyperfine-rotational spectrum of electromagnetic dipole transition rotation of BrF molecules

Chen¹,

Shao²,

Huang³

et al. 2023

Acta Phys. Sin.

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The transition dipole of the hyperfine-rotation spectra of J = 1←0 within the vibronic ground (X1Σ, v = 0) state of BrF are derived, and thus, the transition selection rules are summarized as: ΔJ = ±1; ΔF1 = 0, ±1 and ΔF= 0, ±1, and those of ΔF1 = ΔF are intense while those of ΔF1 ≠ ΔF are weak. Some spectral lines are resulted from both the electric and nuclear magnetic dipole transitions due to perturbations, however, the magnetic only contributes about one-billionth in the spectral intensity. The spectral linewidth is determined to be about 18 kHz by calculating the spectral transition probability. The obtained spectral linewidth and relative intensities are consistent with the experimental results. Additionally, the hyperfine-rotation spectral positions are determined by diagonalizing the Hamiltonian matrix in the basis of |JI1F1I2F>, which is also in good agreement with the experiments within 10-8 (one-fiftieth of the spectral line width). Hence, the microwave hyperfine-rotation spectrum is simulated. In addition, we find that, the nuclear spin-spin interaction not only slightly shifts the hyperfine-rotation spectral positions but also changes the sequence of the spectra. As to those constants unavailable molecules, the fairly precise molecular constants can be achieved by quantum chemical calculation, say for example employing MOLPRO program, and then the simulated spectra can guide the spectral assignment. Besides the guidance of spectral assignment, our results are helpful for other applications related as well, for example, absolute single quantum state preparation.

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“…In order to study the laser excitation spectrum of BrF(B-X), Clyne et al (1976) produced concentrations of BrF between 1 x 1015 and 3 x 1015cm-3 in a discharge flow system, through the rapid reaction F + Br, -+BrF + Br.…”

Section: H Bromine Monofluoride Brfmentioning

confidence: 99%