Negative vibrational frequency

1. What does a negative vibrational frequency mean?
2. What is meant by negative frequency?
3. What happens when frequency is negative?
4. Does negative frequency exist?

What does a negative vibrational frequency mean?

Negative vibrational frequencies indicate a transition state. However، the transition state is defined as having one and only one negative (imaginary) vibration frequency.

What is meant by negative frequency?

Negative frequency is an idea associated with complex exponentials. A single sine wave can be broken down into two complex exponentials ('spinning numbers'), one with a positive exponent and one with a negative exponent. That one with the negative exponent is where you get the concept of a negative frequency.

What happens when frequency is negative?

The meaning of negative frequencies is just mathematical(not physical) similarly to the imaginary part of a complex signal. In real world, the negative frequency does not exists and the spectral content on negative frequencies must be added to the spectral content at the positive frequencies, to save energy.

Does negative frequency exist?

The experimental results show that negative frequency radiation, in some sense, exists. But it also shows that these frequencies are only observed by their generation (either directly or indirectly) of positive frequency radiation.