High-resolution and broadband mid-infrared Zeeman spectrum of gas-phase nitric oxide using a quantum cascade laser around 5.2 μm
High-resolution and broadband mid-infrared Zeeman spectrum of gas-phase nitric oxide using a quantum cascade laser around 5.2 μm
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使用 5.2 μm 左右的量子级联激光器获得气相一氧化氮的高分辨率和宽带中红外塞曼光谱
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Faquan Li
中科院分区：
文献类型：
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作者：
Kuijun Wu;Linmei Liu;Zhenwei Chen;Xuewu Cheng;Yong Yang;Faquan Li
利用宽调谐单模量子级联激光器研究了气相~（14）N_（16）O的高分辨宽带中红外塞曼光谱。在R中的塞曼谱信号（从R0.5到R22.5），Q（从Q0.5至Q6.5）和P（从P1.5到P14.5）基本振动跃迁的分支，X <$1/ 2 2，X <$3/ 2 2（v = 1 ← 0），首次获得了大光谱范围（1824 - 1947 cm-1）和高光谱分辨率（<0.001 cm-1）的记录。我们模拟了R、Q和P分支中的磁塞曼分裂线，计算了纯Hund耦合（a）和（B）以及中间耦合（a-B）情况下的磁塞曼分裂线的L_（1 / 2 2）和L_（3 / 2 2）分量的Landé g因子gJ。在B E和B E的条件下，在各种磁场强度值（从0.04到0.32 T）下测量的实验塞曼光谱通过具有0.012 cm-1的自由光谱范围（FSR）的101.6 mm长的固体锗标准具进行校准。用拉德福理论计算的Landé g因子与实验数据拟合的最佳值吻合较好，表明Hund耦合情况下的Landé g因子（a-b）无论是在高转动量子数下，还是在低转动能级下，对Π 1 / 2 2和Π 3 / 2 2两个子系统都是一个较好的近似.我们的研究结果提供了一个更普遍的证据，以确定耦合的情况下，NO比以前可用的，因为我们可以测量和模拟的高分辨率和宽带中红外塞曼光谱的低和高转动水平的两个子系统。
A broadly tunable single-mode quantum cascade laser operating around 5.2 μm has been used to study the high-resolution and broadband mid-IR Zeeman spectrum of Gas-phase 14N16O. The Zeeman spectrum signals in the R (from R0.5 to R22.5), Q (from Q0.5 to Q6.5) and P (from P1.5 to P14.5) branches of the fundamental vibrational transition, X Π 1 / 2 2 , X Π 3 / 2 2 ( v = 1 ← 0 ) , have been recorded with both large spectral region (over the range of 1824 –1947 cm−1) and high spectral resolution (<0.001 cm−1) for the first time. We simulated the patterns of magnetic Zeeman split lines in the R, Q, and P branches, and calculated the Landé g-factor g J of the Π 1 / 2 2 and Π 3 / 2 2 components for pure Hund’s coupling case (a) and (b), and intermediate coupling (a–b) case. The experimental Zeeman spectrum measured at various values of magnetic field strength (from 0.04 to 0.32 T) at conditions of both B ⊥ E and B ∥ E was calibrated by a 101.6 mm long solid germanium etalon with a free spectral range (FSR) of 0.012 cm−1. Good agreement between the calculated Landé g-factors using Radford’s theory and their best fit values inferred from the experimental data was obtained, which suggests that the Landé g-factor in Hund’s coupling case (a–b) is a better approximation, either at higher rotational quantum numbers, or at lower rotational levels, for both Π 1 / 2 2 and Π 3 / 2 2 subsystems. Our results provide a more general evidence to determine the coupling case of NO than previously available, because we can measure and simulate the high-resolution and broadband mid-IR Zeeman spectrum for both low and high rotational levels of the two subsystems.
影响因子：
2.1
作者：
Fritsch, T.;Horstjann, M.;Muertz, M.
通讯作者：
Muertz, M.