The Fourier transform infrared (FTIR) spectrum of formaldoxime (CH₂NOH) was recorded in the 700–3800 cm⁻¹ region at the Australian Synchrotron with an unapodized resolution of 0.5 cm⁻¹ to identify its fundamental and overtone bands and to measure their relative infrared (IR) intensities in this region. The high-resolution FTIR spectrum of the ${\nu }_9$ band of CH₂NOH was also recorded with an unapodized resolution of 0.00096 cm⁻¹ in the 450–600 cm⁻¹ region for a rovibrational analysis. In the analysis of the A/B-hybrid type ${\nu }_9$ band, a total of 2011 infrared transitions (1655b-type and 356 a-type transitions) were fitted using the Watson's A-reduced and S-reduced Hamiltonians in the I^r representation with a root-mean-square (rms) deviation of 0.000096 cm⁻¹ and 0.000305 cm⁻¹ respectively. From this rovibrational analysis, the $v_9$ = 1 state rotational constants (A, B and C) and five quartic terms (Δ_J, Δ_JK, Δ_K, δ_J, δ_K) were improved from previous work and three sextic terms (Φ_JK, Φ_KJ, Φ_K) were derived for the first time. The band center of the ${\nu }_9$ band of CH₂NOH was found to be 530.0187764(63) cm⁻¹ and 530.018762(18) cm⁻¹ in the A-reduced and S-reduced Hamiltonians respectively. All five quartic and three sextic (Φ_JK, Φ_KJ, Φ_K) centrifugal distortion terms of the ground state of CH₂NOH were also improved with higher accuracy. They were obtained through the fitting of 3020 ground state combination differences (GSCDs) derived from the IR transitions of the ${\nu }_9$, ${\nu }_{12}$ and ${\nu }_{10}$ bands of CH₂NOH, together with 23 previously reported microwave frequencies. The rms deviation of this GSCD fit was 0.000498 cm⁻¹ and 0.000519 cm⁻¹ in the A-reduced and S-reduced Hamiltonians respectively. Additionally, rotational constants and higher order centrifugal distortion terms of the ground and $v_9$ = 1 states were computed from theoretical anharmonic calculations at two different levels of theory, B3LYP and MP2 with the cc-pVTZ basis set, for comparison with the experimental results. The calculated and experimental rovibrational constants of CH₂NOH for both ground and $v_9$ = 1 states were in good agreement.

在澳大利亚同步加速器的700–3800 cm ^-1区域记录了甲醛脱氧肟（CH ₂ NOH）的傅立叶变换红外（FTIR）光谱，未切趾分辨率为0.5 cm ^-1，以识别其基波和泛音带并对其进行测量。该区域的相对红外（IR）强度。的高分辨率FTIR光谱${\nu }_9$还记录了CH ₂ NOH的条带，在450–600 cm ^-1的区域内以0.00096 cm ^-1的未切趾分辨率进行振动分析。在分析A / B混合类型${\nu }_9$波段，在I ^r表示中使用Watson的A减少和S减少的哈密​​顿量拟合了总共2011年的红外转换（1655 b型和356 a型转换），均方根偏差为分别为0.000096 cm ^-1和0.000305 cm ^-1。根据振动分析，$v_9$ = 1状态转动常数（A，B和C ^）和五个四次术语（Δ _Ĵ，Δ _JK，Δ _ķ，δ _Ĵ，δ _ķ）从以前的工作和三个六次术语（改善Φ _JK，Φ _KJ，Φ _ķ）是首次导出。乐队的中心${\nu }_9$发现在A-还原的和S-还原的哈密顿量中，CH ₂ NOH的谱带分别为530.0187764（63）cm ^-1和530.018762（18）cm ^-1。所有五个四次和六次3（Φ _JK，Φ _KJ，Φ _ķ）CH的基态的离心失真项₂ NOH也以更高的精度提高。它们是通过拟合3020基态组合差（GSCD）获得的，这些基差来自${\nu }_9$， ${\nu }_{12}$ 和 ${\nu }_{10}$CH ₂ NOH的_两个波段，以及之前报道的23个微波频率。GSCD拟合的均方根偏差在A-减小的哈密顿量和S-减小的哈密顿量中分别为0.000498 cm ^-1和0.000519 cm ^-1。此外，地面和地面的旋转常数和高阶离心变形项$v_9$ 从cc-pVTZ基本集的两个不同理论水平（B3LYP和MP2）通过理论非谐计算计算出1种状态，以与实验结果进行比较。地面和地面CH ₂ NOH的计算和实验振动常数$v_9$ = 1个州意见一致。